Pregnancy with high HCG?

Erica
I had a M/C 2 weeks ago. My HCG is 67, so I will get it checked again in a week. I'm hoping to get pregnant again ASAP, since my doctor gave us the ok. I took an ovulation test 3 days ago and it was positive already. Is it possible to get pregnant before the HCG level drops back to 0? Could the ovulation test have been a false positive?