I was wondering how long Plan B can affect a woman's cycle before it becomes consistent again?
I had sex at the beginning of November. The condom came off at some point during intercourse, and just to be on the safe side I decided to take Plan B within the next 48 hours. Two weeks later, I got a light period which lasted 3 to 4 days. On December 11, I started my next period, which was again light, but this time only lasted 2 to 3 days. Prior to Plan B, my periods had always lasted a consistent 4 days. Now its January, and I haven't had any period. I'm actually 3 weeks late. I've always been fairly regular (give or take a day or two), but I've never been weeks late.
Since December 31, I have felt pms-like symptoms (irritably, fatigue, weepiness) and an increase in appetite and FELT like my period was coming....but it never has. My mother also has a thyroid disease, which I know can be hereditary. So my question is, can Plan B irregulate my cycle for this long or should I start to possibly consider other medical options if I still haven't gotten my period within the next week or so?