Question about ovulating after miscarriage

So I'm going on 3weeks after a miscarriage. On July 1st, pregnancy test was still Positive. Took another pregnancy test on July 6th and it was completely negative. Something told me to take an ovulation test today and it's Positive. Now question is could I really be ovulating now?? I mean if the pregnancy test is negative, there is a chance that the ovulation could be right??