I just started on the yaz birth control pill a month ago, and I ended the active pills 3 days ago and I still haven't had my period. My breasts are veryvery tender and have been for about the past 2 weeks and they're getting worse every day. I've had no bleeding or spotting, and I get what feel like period cramps at night. Is this just a side effect from the birth control, or is it more than likely a pregnancy? I've had unprotected sex with the pull out method, and I know that it's not 100% effective. I also have a biocornate uterus, would that make a difference as far as birth control goes? If anyone has any advice, it would be greatly appreciated, I'm very nervous and too scared to go get a pregnancy test.