Went to labor and delivery

Im 70% effaced he couldnt feel any dialation bc her head is pushing my cervix back? He said i could be dialated a little but not that he can feel. Im at +1 ... So my question is...if me and my man have sex tonight and he cums in me while im at +1 and 70% will my water break cause im only 35 weeks and 5 days at midnight and i really don't wanna risk her coming early...so is it safe or no?