Heartbeat present but still spotting

I just need some advice whether positive or not, I suffered my second miscarriage on the 8th November and caught on straight after it leaving me now at 7 weeks 3 days - from around 4 weeks I've been spitting, I was booked a scan and everything was fine, baby is settled in the right place and has a good heart rate, they found no explanation for the spotting neither, so now I'm left in limbo. The two previous miscarriages have me constantly on edge and my emotions are everywhere waiting to lose my third baby. The spotting is still carrying on now and comes and goes, usually stays for two days at a time then eases off for a few days and starts back up again. Can anyone offer me some advice or has anyone experienced anything similar?