Can someone here help me figure out when I approximately ovulated?

getting that many positives might just mean you caught your LH surges on the way up and on the way back down. after getting your first positive opk you should ovulate 12-36 hours after so it's very possible you ovulated close to 36 hours after reading your first positive. you got 3 days that all came up with a definitive positive and then on monday it started to lighten. my guess is you ovulated on either saturday or sunday. but if you have had plenty of BD then you should be good to go! now unfortunately comes the dreaded 2 week wait! for you it might be longer because you said your cycles are from 35-40 days long so you might not get a missed period for longer. take a test the day you miss your period. you can get a first response test also which says it can give you accurate results 6 days before your missed period...but just remember that your hcg levels might not be high enough yet before your missed period. you can also go to the docs and get a blood test done to see what your levels are at. they may also want to keep an eye out because you did have a miscarriage. i wish you luck and baby dust to you..and im very sorry for your loss.