Me and my wife had unprotected sex about two days after her period. During her period she bleed normally the first day and then spotted for two days. I pulled out right before I came. We have had problems conceiveing in the past without her taking meds and she has had several miscarriages. About a week or so after we had sex she fell hard on her bottom. The next day she woke to see blood in her panties and that was light but continued for about a day and a half. She also had some light cramping during that time. Is there a chance she could be pregnant? Could that be implantation bleeding?