Determine the first day of your last period

It’s important for your provider to know how far along you are in order to give you the best care — if you are not sure when your last period started, it is hard to figure this out without an ultrasound. In order to get treatment with Hey Jane. you'll need to know the first day of your last period. If you don't use a period tracker app, try associating your last period with an event you certainly know the date of.

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