Pregnant? I Might Be Crazy

Okay...This probably sounds really stupid. But i'm paranoid about things like this. I've had one constant period for about 6 months (there was obviously something wrong with me, I had called and the nurse said my flow might have been messed up because of increased physical activity...) but I decided to go to the doctor after a few months because 6 days is enough...But a period for each day of the month..No good. So anyways, I got put on yasmin and I still had the period each day but it was somewhat lighter. I decided to skip the placebo pills to make it easier for me (it would be really heavy if I took them). So after my 3 trial months of yasmin, I went to get my next prescription. Okay...Now...2 weeks ago from yesterday, me and my boyfriend had dry sex. We were both wearing jeans and it ended up not being too near to my "area"...It was more on the inside upper thigh. Anyway...I ran into the bathroom to change my tampon (which I pretty much need to wear everyday)...And before I did that, I touched the spot on my jeans to see how wet it was (wasnt wet...I got no wetness on my hands, but it was a spot). Is there a possibility I could have gotten semen on my tampon when I put it in? Or would the sperm be dead already after being in the fabric? If it didnt even get moisture on my hand is there a possibility I transfered it? I dont know why i'm so paranoid because I was on yasmin (not taken the same time every day though, sometimes missed because I wasnt sexually active so I wasnt taking it faithfully) but the thing is...After having a constant period for many months, it seemed to slow down alot...Now I only have hardly any color on my tampon, there is like only a tiny spot here and there. Could this just be from the new yasmin? Is the trial packs different from the new prescription I got? I'm sorry if this sounds stupid, but I guess I want to know if there was even a chance. Thank you.