SEX BEFORE DOCTOR VISITS‼️

Soooo I’m dilated 1cm as of last week , been taking brethine twice a week for contractions & Currently 30.3 weeks Preggo... I wasn’t told to avoid sex but with weekly appointments I’m kinda iffy... would this throw off my check up or anything? Do you avoid sex before prenatal visits? I’m supposed to go in for another brethine shot tomorrow so I told my DH to wait until after the appointment even though I wanted it too! But I felt so bad letting him down in the middle of his “mood” 🤣🤷🏾‍♀️ what are you guys thoughts?