Ok so my question/ story is long and confusing but I need help/advice so here goes nothing:

i am 20 yrs old and I am currently in a relationship. I have been with this person for a year next month, and there is a chance that I could be pregnant. I have talked to him about this and we are not fearing this but I need some answers from someone. We have sex without a condom and he "pulls out" before he ejaculates. Well I started my period the last time on march 1, 2005 and so obviously I am late. Well I do not know when I ovulate and such and this may sound stupid but it confuses me so any help there would be greatly appreciated as well.So therefore I wouldnt know how far I am or the chances of me being pregnant right now. For about 3 days last week off and on I began to feel sick to my stomach but never threw up and I have been sleeping a lot more and peeing a lot more. I also have always had large breasts and small nipples but I noticed the other day that my nipples seem to be getting darker and larger (could this possibly be b/c they are still growing?) so I am not sure if those are symptoms or not. But my medical history also plays into this I was in a relationship before this one for about 2 years and during that time my period came very rare like maybe once ever 5 months. I went to my Dr. And he didn't know anything he took tons of blood and did tons of test but never an internal ultrasound or anything and told me I had polycystic ovaries (which thankfully turned out to be untrue). I had evenatually went to about 5 different Dr. Including emergency drs and not one person could tell me what was wrong. My insurance ran out and I couldn't afford to go to a obgyn. So when I left that relationship my period began to come around more often but never regular. So I personally concluded that it may have been due to stress from my last relationship. And since I have been in this relationship we have only had one time when I was late enough to take a test, so I am not sure if I should be concerned or if this just may be a repeat of earlier problems. I know that it is possible to get pregnant from precum. I also had a miscarrige when I was 17 so I dont know if that can cause problems with getting pregnant or if that maybe a reason for my problems. Any advice would help. I know the thing to do would to be go and buy a test but I don't want to get my hopes up again I would like to get some advice on this before I think about it way too much, not to say that I don't care I want to know so I can get the care that I need now but I feel that you guys may be able to tell me more about my situation than a pregnancy test can. Thank you for your time and sorry for taking up so much room :oops: