Am I a mommy to be?

Hello,

My name is Jackie, this is my first time ever using a forum to answer a question. I'm 19 and unsure if I am pregnant or not. If I am, I would be about 56 months along. I know it seems crazy that I'm still unsure but I don't think I would be still wondering after this long if something wasn't up. I've taken a pregnancy test at home and it was negative... Actually 2, one when I would've been about 23 months and one just this past week. I haven't gained much weight just a few pounds but that's normal since I haven't been to the gym for some months now. My period has always proved to be very regular unless I was stressed but I have been having a lot of irregularity since about 56 months ago.... I also had a blood test about 23 months ago which was also negative. Most people would stop worrying then but it runs in my family for pregnancy not to show up on either tests... I've always had a little gut, almost flat tho and when my stomach started getting a little bigger I kinda associated it with not going to the gym but I was still able to hold in my stomach and it appeared flat...then after eating or at night it seemed bigger. But lately it's incredibly difficult to hold it in and it makes me tired or short of breath and uncomfortable. If I barely have anything to eat, my stomach definitely gets much harder and sticks out so I can't really even try to hold it in.. a couple guys have asked if I'm pregnant so I thought that was weird since guys don't usually notice much. I often get nauseous from these weird feelings I get in my stomach and I'm not sure what it is, I sometimes think it's cuz of what I'm eating but my diet hasn't changed much.... ever. My breasts haven't changed much but if I squeeze my nipple more often than not a liquid will come out, it's not a lot though. I've debated going to urgent care or ER and complain of abdominal pains so that they can just look in there without a pregnancy test so I can know forsure. I'd just like any feedback or advice about this. Anything at all will help, thanks ladies!