My period is a few days late, when I went pee last night I whipped and I saw very light pink on the toilet paper, non in the toilet. So I assumed af had arrived. So I put a tampon in and when I woke up today there was absolutely nothing on the tampon..

I know IB usually occurs 1-2 weeks after ovulation. But in my case this is much later than normal IB starts.

Is it possible for IB to be so late?

I don't use OPK so I don't really know for sure when I ovulate, although I do use this app and it shows I would have been ovulating around 8/11.