Pink discharge 8 weeks pregnant

Alex

I’m 8w2d pregnant and began experiencing a moderate amount of pink discharge that was enough to get on my underwear and consistently when I wipe. I’ve been having horrible cramping for the past 2 days. My last ultrasound was at 7 weeks and the baby was measuring 2 weeks behind my original due date - heart rate of 150. Could this be the start of a miscarriage?