I use the kyjelly ultragel. It's amazing and water based.
If you're afraid of the scents and chemicals you can always go with KY jelly but it's not much of a stimulant. Just lubricates.
Well I used it (pure romance) the first month of my pregnancy because I didn't know I was actually pregnant. But didn't really use them after cause I wasn't really sure but pure romance claims that all there products are safe and filled with good natural stuff. But I can say that my babies are fine and I'm 17 weeks now. So I'm sure that it's probably okay. I did still use lube for oral but didn't with the downtown. Hope that helps a little!