I can be very aroused

and really want it but as soon as he try’s to go in it’s like my vagina is just way too tight he can’t even get the head in.

It making me not want to have sex because it’s either painful or I just end up changing my mind even though I wanted it.

I’m 20 weeks pregnant and we’ve tried using lube etc. I’m always more than ready for it but my vagina has other plans.

Any advice..?