By the way... what WOULD Have an impact on how early or late you ovulate? DH and I BD"d not only on CD12 but also around CD15-19.... So the timing should've been correct.
last month I took an OPK on CD23 and it came out close to pos. when normally I'd have no second line at all. we did BD that day but nothing happened.
I took that OPK on a whim .... I did take OPK's this month from CD13-CD20 and one more today CD23... but no dice. I didnt' even get a hint of a pos. I guess maybe If I'm not preggo this month I should invest in one of those Ovulation predictor machine's (clearblue or something)
Michelle is right, You ovulate mid cycle based on the average of days your cycle is.
So if your cycle is long like 30-33 days then substract 17 from 32 and 13 from 32 and that will give you a mid range of when your O would be. Which would be Between CD15-CD19.
I know when I was ovulating because of the ovary pain that I always felt so I would count how many DPO's until AF and I would know how long my lutheal phase was so I would substract that from the average length of my cycle and that would give me O for the next month.
I don't know if I'm explaining myself right, but you do have to get your math correct to know when you O. An OPK works pretty well in telling you when you O, so that would be easy.
No to answer your question. I charted my temps for a year to avoid pregnancy before getting pregnant this past December. When I first started charting, my cycles were pretty long due to having a 6 month old, getting off the pill and breastfeeding. But if I had one long cycle, that had no bearing on the next cycle. Just remember that the longer your cycle, the later in your cycle you ovulated. Also remember that fertile CM can also mean that ovulation is approaching and not that you are necessarily ovulating on that particular day.
So, if you started your last period on CD37, you most likely ovulated on CD23 that cycle. But if your average cycles are 30-33 days, you could ovulate anywhere from CD16 to CD19.