11Months Post-Op, 20 or 21 Weeks Pregnant - OB/GYN changing due date, baby measuring...

I got pregnant about 8months post op, just calculating from LMP and ovulation date, yet my current OB had been changing to due date on me since the baby is measuring a bit smaller, now from what I understood from my surgeon its common to have smaller baby so soon after surgery. My OB has no idea and has never had a VSG patient, she has even referred me to a Maternal Fetal Specialist. Since surgery I have moved to a different state and following up with a different surgeon. I don't feel too confident with this OB at all, since she has NO clue of what to do with a VSG pt. Just seems like she's guessing as she goes along. Anyone gone through this and any advice?

You should probably use the due date that corresponds with your menstrual cycle (if it was a normal 24-30 day cycle).  If you had missing periods or long cycles - an early ultrasound should have been done to determine a due date.

I am 5m Post op and had my first ultrasound when I was 8w3d pregnant.  the u/s showed a baby measuring approx. 8w5d - so we are keeping my due date based on my last period.

IT IS NOT ACCURATE TO USE ULTRASOUND TO CALCULATE DUE DATES AFTER THE FIRST TRIMESTER.  After the 1st tri - your genetics come into play more and some babies get big, some are average, some are small.  In first tri - the basics are forming, so most babies measure pretty much the same based on gestation.

If your baby is measuring VERY SMALL (Intra uterine growth restriction) you should be seeing a perinatologist at a maternal fetal medicine clinic for extra ultrasounds to check baby's health and growth in the womb.

You shouldn't be changing due dates at this point.  The placenta starts to break down the further past 40 weeks you get.  Sometimes it is safer for baby to come out sooner and get outside nutrition if your body isn't able to give what baby needs in the womb.

Ask your surgeon/WL clinic for pregnancy guidelines to share with your OB.

Also - I'd go ahead and ask for the referral to the MFM/Perinatologist. 

You should also have your vitamin levels check each trimester.

The plan for me and my baby is to see how things go, if baby is measuring small at the 20week anatomy scan, I will start monthly growth ultrasounds with the MFM clinic.  If things seem to measure on track and my vitamin level blood work is all normal - I can be treated normal.

I am lucky and my OB has had VSG herself, so she is familiar with the surgery and what I can/can't do with food.

My surgeon's guideline si to eat when hungry - increase fluids - increase protein by 10g a day (so for me that is 75g as a goal).

Did you have an early ultrasound to gauge gestational age?  

I got pregnant 2+ years after RNY, and my OB also had no experience with a post-WLS patient.  At my 20 week anatomy scan, my baby measured in the 17th percentile, but everything looked normal.  They scheduled me for another ultrasound for 28 weeks to make sure baby kept gaining.  By that scan, he had dropped to the 10th percentile.  At that point, my OB sent me to the MF.  I basically had ultrasounds every other wee****il 33 weeks, and then weekly ultrasounds until I delivered. By 32 weeks, I also had to start weekly non-stress tests.

My MF said to be safe I should stop running even though I track my food and know I was getting more than enough calories.  He could find no reason why baby was small, but thought to be safe we should cover all the bases. My son kept going lower on the percentile chart until he got to around 2.3.  My OB decided to deliver at 39 weeks (C-section).

When born, my son weighed 6.6, which seemed perfectly fine to me.  I guess technically he was at the 9th percentile, but really 6.6 looked skinny but normal.  That's slightly rambling, but I guess my point is not to worry at this point.  Go to the MF.  Keep on top of things and make sure everything is ok.  However, don't panic and stress.  Even at the 2.3 percentile, I did not worry because everything else was great with my pregnancy.  I passed the non-stress tests in record time every week.  In the end, all the ultrasounds were not particularly accurate.  My son was just a small baby.  He's two months old and just now outgrowing newborn sized clothes and diapers.

I did have one early on yet it was the same....right now they have pushed me back a week. The MF is saying there is too much fluid & t jg eyes think t jg r baby is going  to grow too fast plus they are monitoring for gestational diabetes I test 4x a day & once in a while get a spike.

You should be using the due date established by that very first early ultrasound...not the 20w one.

high fluid can be a sign of gestational diabetes...but it can be random too. 

I had high fluid with #2 and I did not have GD.

either way...good job getting in with the specialists...they will monitor baby and help you make the best choices for a safe and healthy arrival.

Good luck!