hello...

my girlfriend is on seasonal birth control.. thats the kind with 4 periods a year.... she was supposed to get her period on monday, but she hasnt yet and its tuesday.. i am starting to get worried that she is pregnant. should i be worried? are there any other explainations?

How long has she been on it? Its normal for the day you get your period to change sometimes, especially the first few periods.

How long has she been on it? Its normal for the day you get your period to change sometimes, especially the first few periods.

this is her second period on this pill. she has been on an other.. lexi pro?

It can definitely take a while for the body to decide which day it is going to want to start on. And really its perfectly normal for it to keep changing. Most women start on day 2-5 of the placebo, but starting anywhere in them is normal. Worry if she misses it altogether.