Bleeding help!!

Emma • TTC #2 with OH, been TTC since OCT 2015 Successful tube unblock on both sides OCT 2017! 1st Cycle IVF Jan/Feb 2020 successful!! 👦 💙 Second round Aug 2023 Frozen transfer 🤞 Trying and praying 💙❤️
According to glow I'm on my peak
Fertile day yesterday, however my opk not been positive, I've either not ovulated yet or ovulated early, AF due 19th August but I've just been to the toilet and I had blood in my urine and when I wiped, only very light?? Any ideas?? Help xxx