Cant get wet anymore

Ok so since this last pregnancy, my son is a month old now I have been having a hard time getting/staying wet. I have never had this problem before until like I said this last pregnancy. I'm excited and into it but it's like even with spit or lube I feel like I still dry up and it's getting frustrating. Is there a reason for this or is there a really good lube to use. I dont see why now all of a sudden this happens. I know it's a little early to be doing anything but I felt fine but like I said this was happening during the pregnancy too so it's not just after because I'm doing it to early.