Dumb question

I don’t know a great way to explain this, but I had my son almost 7 years ago and my husband and I have been trying to baby #2 but I can’t get very wet for some reason so we have to use lube (pre-seed). Also, I don’t get very horny, but we want another baby so he just Cums inside on me, while I lay there to try and enjoy it lol (which he is okay with). So, my question is, Do I have to be really wet and do I have to cum to get pregnant? And could I get pregnant even if we have sex for like 10 mins every other day?