Hi. I am using birth control for quite a while now. Wednesday the 5th I started using antibiotics. I had sex the Thursday (6th) and Friday (7th). I was suppose to start my period Saterday the 8th, but nothing is happening. I feel fine, just a little irrateble and a little sick to the stomach, but further I feel fine. I'm trying to keep kalm. Could I be pregnant? I think its too early to take a pregnancy test.....but I would love to get some perspective from somebody else. Much love