I think sometimes it is hard to know exactly when you are O'ing. Even if the chart says it is, it is always going to base it on what data you have put in. Usually 3 days after you O your temps will be higher than they previously were and this will show up clearly on your chart. I know the experts say that an egg can only be fertislied 24 hours after O as it then dies, but it cant hurt to try anyway just in case as there can always be exceptions to the rule (and particularly if you didnt have enough symptoms to be sure you ovulated on the day you thought). It is really hard too with long/irregular cycles. I have had more luck falling pregnant before O date as there is a bigger range there (3-5 days I think). Plus I was never sure about O until after the fact. Good luck!
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