Former childfree couples ttc?

My husband and I have been married for 13 yrs. We had 2 miscarriages the first year of marriage and after that we decided that we didn't want kids. Now...After many lengthy talks we have been ttc for about 7 months. We both keep swinging back and forth on whether it's the right decision.. Questioning whether it's just our "clocks" ticking (we are in our mid 30s) or something we truly want. I know people will say if there's any question we shouldn't do it, but I don't think that's really fair. Anyone else in the same boat?