I dont know what to do

Am pregnant from soneone i barley even know yes we been trough allot of things together in a short time and yes i fell in love but its so fast we know eachother for 3 months only secretly i wanted to have a baby but not this way its over between my ex for 6 months and we were together for 2 years now i never got pregnant i thought sonething was wrong with me

I feel guilty for my ex if he will know this cause he will know that its right after him but this new guy he was there for me like he never was my ex was a addict and went back using so i broke up.

But this new guy he is amazing and wants me to keep it. But i dont know what to do