Help please

I’ve been spotting on and off for two weeks now I’m 8 weeks pregnant I’ve had three ultrasounds and each time the baby grows more and more right on track with a strong heartbeat my cervix is closed but she said it looks irritated .. now I just had an ultrasound and exam yesterday but when I wiped today there were tons of spotting and pink discharge I’m so worried I don’t get it .. can everything be normal one day than have a miscarriage the next it’s just when I wipe sometimes or so I trust them when they say it’s normal ?!