I had my mirena removed, had sex the day after that, I had a cycle two weeks prior to having it removed, the day after we had sex, I bled for 3-4 days straight, after that we had sex again, bled again for 1 day on and off, now my boobs are sore, back is killing me, a little abdominal pain, and a strange headache, that just wont leave, two at home pregnancy test and both were negative, maybe i shouldnt have used the cheap kind, can I still be pregnant?