"Vagina smell" during sex

Yesterday after having sex, my husband very gently and reluctantly told me he had a wif of "vagina smell" during. I had had a shower two hours prior, so it's not like I was sweaty and smelly from the gym. In the 6 years we've been together, this is the first he's ever noticed it. Since he said something I've noticed my underwear has a stronger "vagina smell" than usual too.
I'm 8+5... Is it just pregnancy related? Is there anything I can do?