5 Weeks Ago I Had Anal Sex With My Bf

5 weeks ago i had anal sex with my bf and i was on my period
And i've had my period this month on time and it lasted 4-5 days and it was just like every period i have ever got
But after searching online i knew that it's possible to get pregnant after anal sex, the sperm could leak
And it's also possible to get pregnant if you had sex while having your period
And i got paranoid because my belly is kinda rounded when i set
And I'm experiencing some sickness
But i don't have any of the other pregnancy symptoms
So is it possible that i'm pregnant?
Or is it just some fat and paranoia stress making me go crazy!