Once it starts like that, you can't really stop it. If you had talked to your doctor previously about this, you could have gotten on the pill, which you would have needed to start a month prior to this cycle or by taking norithisterone, which is started about 4 days before your cycle starts.
There is nothing OTC that can be taken to stop or delay a cycle.
One option may be the softcup, as a lot of woman will use this when they have an important event occurring. You can read about that here: Read here
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