To whom ever can help me!!!

I am 19 and kinda think I might be pregnant. I am not late on my period as it is not time for me to have it yet, but I have some symptoms I believe. I've been reading trying to figure out if cramping is normal in the early signs of pregancy, but still kind of unsure. The kind of cramps I have been having are worse than my regular period cramps. They are like knives stabbing in me and hurt so bad to where I curl myself up in a ball and just cry. My mom said this could be a sign of a tubal pregnancy by chance but I have no clue. I have also had some constipation here lately which I read could be a sign. I have been uncontrollaby emotional and been having mood swings more than usual. I used to only eat a small breakfast and one meal a day or two small snacks, now I find myself eating 3 full meals a day if not more, which is very uncommon for myself. My boyfriend always kind of kids around about me being pregnant because he can tell I have changed and told me yesterday that my boobs have gotten even bigger than before. My mom thinks that I may be and said she has been having a lot of dreams about me telling her I am pregnant. I know that had nothing to do with it, I was just saying. I'm just trying to figure out if my symptoms could in fact be a pregnancy and if it is sounding healthy. I am worried out of my mind and all I want to do is cry. My boyfriend is supposed to be buying me an early pregancy test today but I am scared to take it because if I am pregnant I will cry because I will be worried about everything, and if i'm not pregnant I will cry even more because all that will do is make me sad and upset. I know this is incredibly long, but if someone could please let me know what may be going on and what I should do I would greatly appreciate it. Thanks so much for your time and I hope someone will respond very soon.

Thanks,
amy