Has this ever happened to any of you? Provera, femara

So I’m on provera to induce my period, but while on provera my period came 4 days of taking provera. That’s has never happened to me before, usually it comes 10 days after the last pill. Anywho, I was also told to take letrozole on day 3 of my cycle which I did and a few hours after taking letrozole I went to the bathroom and there’s no more blood. I’ve only had my period for 3 days and now it’s gone, I don’t understand. My cycle normally last 5 days when it comes on it own. When I’m on provera it last 8 days. I’m wondering if this will affect ovulation cause I’m ttc?