Ovulation after miscarriage

Hi had 6 weeks MC july 6th. I stopped bleeding after one week (July 11). I started testing ovulation and had couple of blood works to make sure my HCG went down to zero. On July 13 I had my last blood work and HCG was zero. On July 18 I got positive ovulation test & rise on bbt. Is it normal to ovulate this early after MC? We BD those high & peak LH surge and currently waiting to test. Is it possible to fall pregnant?