Hey there, Pancakes. I'm happy to answer your questions.
Swallowing fluids from oral sex never creates a pregnancy risk but always potentially poses STI risks. Being pregnant doesn't change that.
In terms of sex during pregnancy, so long as it feels good to you and is what you want, you can engage in sexual activities during pregnancy. Sometimes you'll need lubricant, just as is usually the case for people who are NOT pregnant: given how early you are in your pregnancy, the dryness likely didn't have anything to do with your pregnancy. If you've never experienced that before, you're overdue: it's most common for people to have "drier" times, even sometimes when they're turned on, and want or need lubricant for activities like intercourse.
There isn't any lube on the market that's not safe for people to use who are pregnant. But if you're new to lube, period, this piece can give you some info to help you choose:
Lube 101: A Slick Little Primer!
Assuming you want to stay pregnant with the aim of delivery (it sounds like you do), you need any help getting set up with/starting pre-natal care?