***confused???

I've been off of the depo shot for over month now & I'm having sex way more often with my boyfriend. I've heard stories where women get off the shot and not even weeks later get pregnant. I took 2 tests about 2 weeks ago, one was inconclusive and the other was negative. I've had sore, sore boobs for a couple weeks now, my sister and boyfriend have said that they looked bigger and more perky. I'm very sensitive to smells and certain smells make me feel sick and throw up. Not to mention i haven't had my period yet. thoughts? ???