Pregnancy symptoms two weeks after sex ?

About 2.5 weeks ago me and my long time boyfriend of three and a half years had sex. We began with a bit of foreplay of the oral kind during which time he ejaculated. Usually he is the type that ejaculates once and than afterward has dry ejaculations; however there have been times...rare times, usually during oral sex, that he will ejaculate again. Afterward he put on a condom and we had sex. Right after sex, I pulled off the condom. We were joking around at the time and I grabbed the tip and pulled it off during which time i heard the snap as it sprang off him. We make it a habit of inspecting the condoms we use to check for any tearing or breakage, and this time we discovered a small tear on the lower side (near the base not the tip). We even checked it with water and sure enough there was a hole through which water dribbled out of. At the time we worried about it but concluded that considering he didn't recall actually ejaculating, odds were it torn when i foolishly pulled it off. However, recently I've been experiencing headaches, heartburn, digestion problems,semi frequent uriniation, a small yeast infection,fatigue, and mood swings. - Yet technically all of those symptoms can be explained. I am transfering to another college next semester, and since i'm very family oriented it's been a very stressful decision. I'm taking 3 sciences along with their corresponding labs and other anthropology and statistics courses in the university i'm attending so that and considering i'm a natural born "worry-wart" has made me a very stressed out person which would explain the headahes and fatigue and heartburn (which runs in my family also). In addition, I have a small yeast infection every 7-8 months or so although it has been a year I think since I've last had one this is still not a completely abnormal occurance. I am one of those people who drink water all the time so the semi-frequent peeing isn't all that rare either and maybe i'm just being observant with what would be my regular urination. I also just the other day had a girls day with a friend during which time I ate a huge variety of junk food that included nachos, hot cheetos, pickles, and a corn dog, which probably accounts for my stomach problems. I expect my period at the end of the month although I am not always punctual (sometimes i'm a day or two early or late) it is always around the same days which should be everywhere from 4-7 days from now. I'm 18 years old and although I'm sure my boyfriend is the "one" and he says no matter what he's behind me 100%- I do not believe now is the right time for a child in our lives.I realize I might just be overreacting however I would greatly appreciate any advice and input anyone would have to offer. Please.