So I've Taken A Pregnancy Test After Pregnancy Test And

So I've taken a pregnancy test after pregnancy test and it came out negative and it took a blood test and still negative but I missed my period in March and I had a February and now I have it in April but it's lighter than usual I think it's almost done and my stomach is kind of hard and It hurts to lay on my stomach, my breasts hurt along with my back.. My stomach growls at me a lot and when I push down on my stomach and let go it's painful and it feels funny and I've been really sleepy and eating more then usual and my pants are getting tighter, opinions ? And another thing is when I'm laying down on my stomach and I moved to a different position my stomach hurts as well