Help. Am I Prego

1. My last period was July 11-14. 
2. My cycles are generally 25-30 days long. 
3. 5 days later, we had sex (And my fertile week was just a couple days a way and ovulation was 5 days away).We used spermicidal condoms. When he came, he pulled out with the condom on and the condom DID NOT break. Now saying this, when we had sex in the 'cowgirl' position (him laying down and me on top of him), I looked down and there was this white stuff at his pubic hair. Was it his pre-cum? Is it my cum? Please, is there any chance of pregnancy?? 
4. Now this is where I start to freak out. I've never been sick in a car. 6 days later, I threw up in the car. Is this a sign of pregnancy? Can signs of pregnancy show up THIS EARLY?!
5. I got on Birth Control that day, and two days later (today) I threw up again in a car. 
Please, be nice. Please help me out. I'm freaking out and I need help. I know that Nausea and Vomiting is a symptom of the pill BUT I wasn't on the pill the first time I threw up!! Am I pregnant? Please help. 

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