Pregnancy Question/Comcern

Okay so my fiance and I had to do artificial insemination at home to concieve for obvious reasons so with that being said our sex with each other is oral sex....my question is is it safe for him to perform oral sex on me being 5 weeks pregnant without hurting our baby bean...Definately don't want to jeopardize anything.....Hate to ask my ob Dr...kinda embarrassed to...they are aware how we got pregnant....Help!!!!