So I just started my first pack of birth control and I'm on my placebo pills and my period hasn't came. Rewind to the beginning of the pack, my significant other ejaculated in me On the second day of my pills and the week after that I was extremely thirsty all week and now my boobs are extremely huge throbbing and sore!!! I've taken two pregnancy tests and both negative and have had a couple of days with nausea. Still negative pregnancy tests! And still waiting for my period.