How do you calculate when you should start your period one month to the next?

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The average menstrual cycle is 28 days, but everyone can be different.

You count from day one of your period up until your next period, this is one cycle - figure out the average of your last six cycle to give you an idea of your average cycle length, anything within a week of that is considered to be normal. You can use period tracking apps to work this out for you.

You may also want to try using Fertility Awareness Method, this allows you to track your cycle on a daily basis so you know exactly when your period is going to start.

It's said to be a 28 day cycle. Mark the first day of your period on a calander in one colour count out 28 days forward and mark it with another colour. You will be due 'around' this date. When the next period comes mark the day with the first colour. You should find that your period comes around the same day each month. You'll very quickly learn exactly when your due, unless your periods are irregular.
Cycles vary from woman to woman. For most its a 28 day cycle but can range upto 35 days. But just do what the above answer has suggested because this is the right way to do it. It will take atleast 3 to 4 months before you actually see a regular patten. Unless of course your period is irregular.
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What if you have two periods one month but skip the next month?

This is quite common if you're under two years of your menstrual cycle. All this means is that your body is going through some tremendous changes, and your body is just having
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Could you have your period on the 10 one month the 12 the next and the 15 th the next and i have not started yet could i be pregnant?

As long as you keep having your period then you are most likely not pregnant. Remember that you body follows a monthly cycle that does not line up exactly with the months of t

To be pregnant and have a period one month but miss the next month?

Its not possible you dont have your period at all if you pregnant and you wont have a normal period if you are its possible that it wont even come on which is a missed period.