Hoping someone can help me.

Hey, ladies. So, this is my second month using Glow and I'm TTC baby #1. I have now had two periods after my mirena removal & the last one was 6 days late (never had an issue with being late before and chucked it up to being my hormones adjusting). When I tried doing the ovulation test strips two weeks before my last expected period. I never had a "definitely positive" strip. But, something told me to test again at CD 34/35 & it was my most positive strip yet. I could feel the physical symptoms of ovulation and did the temp check. I'm just curious when I should test for ovulation with me having a 37 day cycle this last time. I really don't want to miss it again. 🙈 Also, are my chances of conception less due to my cycle being so long? My last AF started 2 days after the positive opk.