Is it to late??

Hi guys I haven’t been on here for a while and haven’t posted anything for a bit so.....

I had a nap on Saturday and woke up on Saturday afternoon to ewcm a medium amount of course I ripped off my partners pants and we did what we needed to do. Sunday went by with nothing and today when I came home from work I went to the bathroom and when I wiped I had very light pink marks on the toilet paper. My question is if this is ovulation bleeding if I did the deed tonight (which I already have) is it to late to catch the egg or is there still time?? I’m feeling rather achey around the bottom of my back and wondered if I’ve still got a chance??