Partial Molar pregnancy - really want to have another baby

I had a miscarriage in October, which turned out to be a partial molar pregnancy. The doctor is monitoring my hcg levels until they get to zero to make sure I don't have cancer. After hcg is undetectable, I have to wait 6 months to make sure it doesn't rise again. Until then, I cannot conceive and I am worried about how long it may be until I can start trying again. Has anybody on here had a partial molar pregnancy? How long did it take for your hcg to become undetectable in a blood test? It has already been 4 months for me and I'm still waiting.