Husband can’t cum

I’m 17 weeks pregnant with my second and my husband can’t cum whenever we have sex. This has happened 3 times. He says he likes it but he can’t cum because I feel looser. He said this when I was pregnant with my first and we stopped having sex basically throughout my whole pregnancy. Do we get looser while being pregnant? I also feel like it is, it doesn’t feel so great it’s kinda like whatever.