Can having sex make your period irregular. I can pinpoint my periods coming much later (i usually started like clockwork give or take a day or two), since I first started having sex, and my period has even come up to two weeks late. I'm one week late now (took a test, it's neg). I'm waiting for this period to come so I can get the patch asap.

As for the patch, or any birth control for that matter, when you start taking it, does your period last for as many days as it did before the birth control, or does it last longer or shorter? Mine usually lasts 4 or 5 days.

Any advice would be appreciated.