I had sex with an old girlfriend this morning. Everything was great, and I finished in the condom.

I used my fingertips to pull each end of condom at its base and carefully maneuvered it downward. As I got halfway, I noticed strings of pearly white lines. I looked into the condom and notice there wasn't a lot of sperm.

I freaked out a little bit, so I inspected the condom noticed a few bubbles around the base. I filled the condom with water and carefully wiped away the excess water with tissue. No leaks.

Not sure how sperm managed to inch its way up, but I'm concerned whether it escaped. I wasn't penetrating deeply toward the end of sex.

What do you think? Am I at risk of STD? Could she end up pregnant?