Af showed

My cycle seems to be on track. Counting the day I miscarried as cd 1 puts that cycle at 35 days which isn't even my longest cycle. (It's my second longest with my longest being 37 days)
This will be my first time ever using ovulation tests and I don't really know for sure when to start them. My average cycle length is 31 days and the instructions say that for 31 days start testing on day 14. Is that right or should I start on a different day since I don't have dead on cycles? Chances are if I actually do ovulate this month we won't miss the chance because we have a schedule of bd, never going longer than 3 days without, sorry if thats tmi. It would be nice to know if I ovulate though. Any info/advice is appreciated!