I had a miscarriage nov.30th and my period returned 4 weeks exactly after. The 1st cycle was 3 weeks and we didn’t try that time to conceive. 2nd cycle we tried and I tested for ovulation. I ovulated on day 14 but then started my period on day 21 of cycle. So 3 week cycle again. How on earth can I get pregnant if my body already sheds my uterine lining by day 21 before possibly the fertilized egg can even implant...anyone else experience this?