How to work out due date?
Right- I know the normal way to work it out is 40 weeks from first day of last period but I had very long cycles (35days ish) so I think I probably would need to add a week onto that date... The thing is, while we were trying I was taking opk tests every day according to the tests I didn't actually ovulate until day 36 (!!) of my cycle then I got an absolutely clear positive pregnancy test just 10 days after that. 
Are opk tests sometimes wrong? I find it hard to believe that I actually conceived when I got the positive opk as I don't think I would have got such an obvious BFP just 10 days later (photo attached of the test which showed up instantly), maybe I ovulated at the normal time in my cycle but the opk didn't show anything (I didn't even get faint lines until day 34/35 of my cycle). Is this possible/likely?
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