Confused

Soe and my gf have been dating for four almost five months and are trying to have a baby and are about to take a huge step in moving in together. To be honest in the beginning our relationship was to die for, but now ever since i have allowed my paranoid thoughts of not trusting people creep in it just seems like we're not on the same page. We both have children from other people she on the other hand was married for eight years. Although she says it's nothing and doesn't care about him I still have my doubts on the direction of my relationship and if we truly are supposed to take these steps if I feel there is something that she is hiding from me. All I ask is for communication so we can get back to just living each other but really am only getting the burden signs. I really don't know what to think or do...