Stopping progesterone to get period

Nicola

So I'm taking progesterone after I've got a positive opk due to low levels. Today I'm cd13 and negative pregnancy test. I'm cramping a little and when I wipe it's faint faint brown. Last month I had nothing, no cramps or slight spotting and I stopped the progesterone at cd14 and period came 4 days later. Is it safe to say I can stop the progesterone now and that my period is coming ??