I had a miscarriage on the 12 December and I would like to know how soon I could become preancy it's been 3 month and I am not preancy yet

The word is 'pregnancy'. Did you have a clinical miscarriage in December? If not I would make a doctor's visit to see if eveything is okay if you are trying to become pregnant again.

The word is 'pregnancy'. Did you have a clinical miscarriage in December? If not i would make a doctor's visit to see if eveything is okay if you are trying to become pregnant again.
Yes I did have a clinical mc

Then yes, that is good, it was a clean miscarriage. The uterus is scraped and clean. I hope no problems.

Anytime, of course it can take months even a year or more for a healthy couple to become pregnant