First Time Mom Concerns

Im currently 30 weeks pregnant my husband has been cumming in me every time we have sex since the first day we found out we were pregnant . I recently was reading on here that a mans cum softens your cervix and makes you go sooner to delivery . I'm a first time mom so all this worries me. Recently my doctor told me my baby was showing to be a premature baby . Does anyone think it has to do with my husband cumming in me ?