External/Internal Orgasm

Does anyone else have any problems getting off externally? It takes forever to get me off externally while penetration is happening. My husband gets mad if i use anything besides my fingers rubbing my clit. And i get off always internally. But if i dont get off externally he thinks somethings wrong. I can cum watching our videos and while he eats me out after awhile but it feels like its impossible while having sex. I am 37 weeks pregnant and i feel like that is a factor