Okay, so i had sex October 15 and I used a condom and vaginal spermicide as protection. As always, I get super paranoid that I am pregnant and I bought First Response pregnancy tests. After sex, I got my period about a week or two later. I tested for pregnancy, 21 days after just to make sure and I swore I saw a very very faint second line. However, I tested the next day then again 4 days later and both negative. Now, at 5 weeks, I tested again and it is once again a faint second line. What do I do? What are the chances I am pregnant?