Thoughts on spotting this time in my cycle?

Se

So the app says I ovulated the 16th, I had unprotected sex the 15th. Had a tonnnnnn of ewcm on the 16th and stopped by nightfall.

Woke up today with quite a bit of bright white creamy discharge and a few spots of blood… nothing much really but quite obvious on the paper. Thoughts? Not trying, we just had a few birth control fails this month.