Our expert says:
Day 1 is the first day of 'proper' bleeding. The first day of the next period is both Day 28, if that's what it is, and Day 1 of the next cycle. So your cycle was 26 days and you should ovulate on Day 12. You should have intercourse from 3 days before to 3 days after your calculated ovulation time, so that one or two days difference doesn't really matter.
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