Help I’m confused!

Ok so my cycles are usually 36 days but sometimes vary by a few days. I got a positive on an opk last month at day 20, we TTC but unfortunately didn’t get pregnant. I got my positive later this month on CD 24. We had sex around this time (I forgot to log). Now I’m on CD 33. I started feeling like total garbage today and when I just went to the bathroom I had a very small amount of pink on the toilet paper when I wiped. Implantation bleeding or period? I think it’s probably my period but I’m just confused because I thought the phase of your cycle after ovulation was always consistent, about 12-14 days after ovulation is when you get your period? If I’m getting my period, it’s only 9 days after ovu. Can this happen?