Period 10 days late, pregnancy symptoms..finally got period

Hello

I'm 17 years old and me and my boyfriend always use protection while having sex. About 6 months ago we agreed to withdraw from having sex until we were more ready. On Friday, January 12th we had sex again but this time unprotected. After a little while I became scared because we were not using protection so I told him to stop so he did. He finished himself off outside of me but he did not cum inside me. He didn't even come close. Immediatly afterwards we both did some research and we learned about precum and how it contains sperm and because we did not use protection..that we could get pregnant from that. I tried not to worry but as the day for my period approached I became extremly stressed out and worried that I was pregnant. I started to experience random sharp cramps in my stomach or lower back. They didn't hurt and it wasn't constant but it made me think I was pregnant. I was certain I was pregnant but decided to wait a week before I went to go get a test. A few days after my missed period I started to constantly check for spotting. About three times all on different days, I think I saw a tiny spot of light faded red blood. I freaked out and after that I started to have tender breasts. I didn't know if I was freaking myself out so bad that I was makign my body invent these symptoms. One day I woke up and had this metal taste in my mouth but it went away right after having breakfast and since then hasn't come back..I do sleep with a retainer so could that have caused the taste?

After a week and still no period I became even more worried. It was all I could think about. I would stay up till really late reasearching about symptoms and stories and it really started to scare me. Two nights ago I had a terrible night in which I was crying and crying because I got in a horrible fight with my best friend and my parents. I drank two glasses of wine all within 10 minutes, watched a movie and fell asleep. The next day I felt fine but around 9 at night I got a terrible headache which lasted all night. I know that's another sign of pregnancy so by then I was sure Iwas pregnant and decided to suck it up and go get a pregnancy test. Last night I went to bed sure I was pregnant but this morning I woke up and had the cramps that I always get because of my period. I tried not to get my hopes up but they were persistent. I went to the restroom and when I wiped I saw a spot of blood. This scared me because I thought it was the spotting again. But after about 15 minutes the blood became more. It's still rather light though...watery even. This has happened to me before however..where the first day is light but it will get heavier as time goes on and then light and then end. But the cramps are terrible (I always get horrible cramps!)

Now being the spazz that I am I'm still reasearching and finding that you can still get your period and be pregnant.
I was well over a week late but could it have been because of all my stress? I've had a horrible past few weeks stressing about all of this. And what about all my symptoms? What should I do? Any advice? Am I pregnant? =/