Concern...

This past Monday I have my appointment to check how things going with my baby girl.
When the nurse call me she did a pregnancy test like always. She ask me if I had sex the day before I say yes, the reason why she ask me was because she found a little be of blood in my pee. She told me I even have to stop or take things slowly while doing it.
I got so scared after that, it makes me not to have sex but on the other hands my sex drive it really high! 
Any advices would be appreciated thank you!