A cycle goes from the first day of your period to the first day of your next period (it does not matter how many days you bleed for). I would highly suggest using opks and/or tracking ovulation with bbt if your cycles are only 18 days long as you may have a very short luteal phase which will make implantation difficult or a very short follicular phase which might mean immature eggs. In any case, it will help you time bd better and you will know when to expect your period after a couple cycles of tracking as luteal phases typically dont vary by more than a day.
Missed period
It is my High fertility day today and am doing the deed with my boyfriend I'm not too good at calculations but if my periods last 4 days and I have a new period two weeks after my last one ended and my period was 7th -10th August what date would I know if I missed a period new to tracking cycles and am a bit simple so not good at the maths to work it out
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