Miscarriage and missed period

October I had a miscarriage. Since then I have only had one period, maybe two. The longing to be pregnant is so strong that I don't know if I'm mentally causing it, or if something is wrong. I don't want to go to a doctor, even though I know I should, because of what they might tell me. I've already taken tests to see if I am pregnant again, and it was negative. I'm just grieving and wishing and hoping I don't have another medical problem. Has anyone else dealt with something like this?