From everything I've seen and experienced... if you have your "bloody show" labor will begin in less than 24 hours. It did for me. You will also probably lose your mucus plug. I lost mine in the bath. That should happen before your bloody show but both can happen together. Then just wait because you will know!
Tightening in ur stomach... Followed by pain in ur lower back making its way to the front ....VERY uncomfortable.