Okay ladies so yesterday was ither my last day or the day before my last period. I am on the marina 3 year birth control but I hear a lot about it moving so it scares me. I did have intercourse last night and I woke up with pain in the middle of my chest and my stomach thumping to where I can feel my heart beat by placing my hand on my stomach. Why is this? Could that have anything to do with it ? Should I worry? Has anyone had any experiences like this. TAI