It's unlikely. The egg has a 8-24 hour life cycle, so you need the sperm there waiting before O to optimise your chances of conception.
I've found FF to be very accurate, assuming you're doing things right. I recommend you do the charting course on FF if you haven't already. Using natural family planning methods, you can only identify O 3 days after, because that's when you can measure a consistent temp rise. However, O can occur up to 2 days either side of the temp rise.
The main way to "predict" O is through identifying fertile cervical mucus. Some find using OPKs can help, but it can be expensive. A Maybe Baby can help you identify when you're nearing fertility, but I wouldn't bank on that either, as some people like me get full ferning after O. Others use digital ovulation monitors. These are also expensive, but if you have irregular cycles, they can help.
Looking at your chart, I wouldn't be 100% yet that O has occured - you have a lot of temps in that range previously. Which is why you have dotted crosshairs. Are cycles these length normal for you? If so, have you seen a doctor about it? Charts like that with temps all over the place can indicate PCOS. Alternatively, could you be pregnant?
GL. It takes time to learn how to chart properly. I hope it helps you.
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