Feb 22 I had unprotected sex for the first time in 8 months. My period was due March 7th. I had sex. My period usually last 5 days. It only last 2. We ARE trying to conceive. March 23 I had sex again and after I bled a little. No time in between after my shortened period. March 26th it happened after sex again very light mixed with sperm. What does this mean could I be pregnant could it be implantation bleeding. Please help. Thank you