Spotting 5dpo.... help?!

Hi ladies! I am new to ttc, only out second month now. I have been on the pill for 11 years up until sept 2015, so i dont know whether this is normal. According to Glow i was supposed to ovulate on 24/12, but had a surge on opk on 22/12. We had intercourse on 20, 22 and 25th. But then i started to have heavy spotting on 26/12, and it is still heavy today, 27/12. Is this normal, or should I be worried?