Help!

Currently pregnant but I have been stressing over an incident that happened back when I conceived. Basically I’m doubting who the dad to my baby is , the question might be silly but my mind is making me think of the worst. There’s 2 guys involve : Guy A who i didn’t have sex with but on March 25 we were messing around he was jerking off ( not sure wether he came or not ) but 5-10 mins later he fingered me. Then there’s guy B who’s most likely the father to my baby , we had sex multiple times that month ( unprotected) to be exact it was March 12 , March 20 & March 28 that we had unprotected sex. I asked my doctor when I most likely was ovulating , he said around March 29-30. Which was around when I had unprotected sex with guy B. Do you think there’s a high chance it could be guys A baby ? I would do a paternity test but they are extremely expansive (1,500 ) do you guys think I’m just overly thinking this thru ?