Missed period....
I had my little turkey 9 months ago. I had a c section and tubal and went 16 weeks with no period. Then, like clockwork for June, July and August (28-31 day cycles). Then, September came and nothing. October came and nothing. I knew I wasn't preggo because I had my tubes tied. November came and went and bam December 1st she roared her ugly head again. Not sure why, but I think it can take some time for our bodies to readjust. Before surgery and baby, I was NEVER regular and in fact didn't know I was pregnant til I was 8 weeks because I ovulated but never had a period so the positive result was quite the shocker! :) Best shocker of my life however!!
I have always been very regular, it was rare if I went a day or two past or before my P was due. however that being said there were at least two times that I can rememeber being over a week late and then blammo period. lol. I think its just a fluke thing. But I wouldnt rule out pregnancy if it doesnt come eventually.