I am 39 years, my wife 34 years, trying for second baby. We had love making on 19th Dec 2015 & she was lying in same position for about 30+ minutes using pillow. She got abdominal pain after 2 hours on both sides of stomach nearby ovary till 11th day. Breast become tender on 10 to 12th day. We thought implantation is completed. Suddenly breast pain reduced, become loose as normal, stomach pain also gone on 13th day. On 14th day (from 19th Dec 2015), period was come unexpectedly and bleeding is thick compared to other times. Usually bleeding is very less as few drops for more than one year. What could be the cause for unsuccessful pregnancy?