Curious!

So had faint positives 8dpo, 10dpo and 13dpo. Didn’t think af was going to come, just felt different. So af was 2 days late I’m normally bang on with a 29 day cycle I ovulated day 15 confirmed with temps thought I was onto a winner this month. Bleeding started yesterday, but not in full force like it normally is, I’ve only needed to change my pad once today. It is active red, but not alot like usual. Today I feel very rundown, sore throat and generally shattered. I’ve slept literally all afternoon. Is this normal, whatever normal is!