I have been taking vitex for 10 days now, 6 days after taking it i got a period could i get one this soon after starting to take it or is the bleed due to starting the vitex?

I am trying to find out information in regards to when to stop taking vitex, im TTC number 2 and ive heard not to take vitex during pregnancy but then ive heard if taken and stopped during pregnancy it can cause a M/C .