my stomach is actually poking out a little ...?

Hello, so it's march 20 and I haven't gotten my period since the beginning of november. I am 19 years old and newly married, my husband is currently on deployment, so the last time I had unprotected sex was November 28th. I have a past of irregular periods that started to become normal last year. The beginning of December when I should have started my period I just had brown discharge, same with January and February but now i'm 20 days late on my period I haven't had any sort of discharge except one day I had clearish white discharge. i've also have had every sign of pregnancy, i'd wake up nauseous and be very nauseous after I ate, sometimes wake up in the middle of the night running to the bathroom, my breast were sore, I still get killer headaches, cramping, FATIGUE, light headed, my stomach is actually poking out a little more than it used to, I've also felt a flutter and "kicks" especially in my sleep. I still get nauseous but not as bad and I have cravings that if I don't satisfy I'd need to throw up. I am not an emotional person at all! But I've been super moody lately. I have not been too stressed lately even with my husband being gone and I eat pretty healthy. I wasn't planning on getting pregnant until after he comes home from deployment, so he could be here through everything. I would be 16 weeks now, I've taken multiple pregnancy test all came back negitive. I had two blood tests done one came back negative the other came back with a high count but not high enough to say if I was pregnant or not. I read about how birth control can mess up your hormones if you were on it long enough ( I was on it for 4 years) and it can delay a positive reading on a pregnancy test. So if anyone can help id appreciate it!!