Spotting 15 days into cycle

Sarah-Louise • I live in Oxfordshire with my husband Rich, son Bertie and Molly the cat.
Hi ladies,
I'm a bit worried- I've just started spotting 15 days into my cycle.. It started off as brown- now pinkish light blood.. Quite a lot of it. It doesn't look like my normal period.. 
I took an ovulation test but it's saying negative ( I did get a positive on day 7) So it can't be ovulation bleeding. 
Is this my body experiencing a re-boot after MC and starting another AF