FTM NEED ADVICE. TMI

34 weeks pregnant. Last night my hubby and I were going to have sex. He actually was touching me down there and some of my mucus plug got on his hands. We just wiped it away and eventually got to having sex. Now I've never had a problem like this before but he could only go a little bit in. Like not even half of his penis could fit in me. He felt like something was stopping him . my guess is my cervix. Anyway we finished and his penis had more of my plug on it! Is this normal????