Helpppppp

My boyfriend is obsessed with playing with my butthole during sex. He hasn’t done it in a long time for obvious reasons (like me being pregnant) well at 34.5 weeks he did last night and I’m nervous he went from back to front with his fingers and now I’m concerned about an infection that might harm my baby this far along. If I were to get one would they catch it in my urine and treat it fast enough to not harm her?! I’m so annoyed this had to be a thing at this point in my pregnancy but I told my boyfriend no more butt stuff until after birth!