....Am I Pregnant?? ....?

My periods skip on me a lot, but it has been almost 5 weeks since my last one. I have been feeling the need to barf for almost 3 days now, when I think of any kind of food or smell any kind of food I want to hurl. I get up every 1 1/2 hour at night to use the rest room and I have been very snappy to my boy friend. My have grown and are heavier then before, and my nips hurt like hell whenever I touch them or even put a bra on. But I am not craving any kind of food, and other then being snappy and pissy with my boyfriend I do not feel "hormonal ually" like I was the last time I was pregnant. I dont really have the money right now to buy a 14-25 dollar birth control test because we just moved from LA to Iowa City and I have better things to spend money on....like food I am to discussed to eat but must if I dont want to starve... please let me know your thoughts.