Have you ever experienced this?

Okay so I'm in my fertile week right now && last night me and my husband BD. & after he got done I could feel this feeling down there like I know this is crazy but like it had a heartbeat down there working...this morning I have mild cramps I know it's prolly too early for implantion cramps but I'm feeling hopeful! My question is did any of you know you were pregnant after you BD??? Thanks!