“Tighter” while pregnant?

Emily

I’ve been noticing that my vagina has been extremely “tight” lately while having sex. No matter how aroused I am, it still really hard for my husband to get in me like he used to. It’s not painful really, just difficult. I’m currently 23 weeks pregnant and it started getting tight at about 16-18 weeks. I’m just wondering if this is normal or has happened to other woman?