Today was my 4 week check up with the surgeons office.

They were please with my weight loss so far (I.e. 20 lbs).

I discussed with them the increased menses since RNY (i.e. 3 periods in 4 weeks).

Apparently, menses after RNY frequently becomes irregular unless one is on birth control.

Yep.  Mine was irregular for about a year.

Yup, im 6 weeks out and talked to my dr last week he said it was from estrogen that was stored in the fat we are now losing. I had never heard of that before.

I was using the Mirena IUD up until the middle of December. I have been using that method since 2004 and I haven't had a real period except for the occasional spotting once or twice a year. I ended up having my first period a few days after surgery. Although my period so far is somewhat "regular", I can't really compare due to my cir****tances of my IUD expelling so I am most likely dealing with my body adjusting without the extra progesterone.

Keep an eye on your iron! 

I posted about this very same thing the other day.  From my post, I gathered the information that this is "normal" and it may be irregular for up to a year. 

I am on birth control though.  I've tried 2 different kinds since my RNY 5 months ago.

Hang in there!  Some of us are right there with you!