I am 22 year old. I am try to conceive and doctor gave me letrozole tablet told me to go for check up on cycle day 14 and ovulated .after ovulation told me to take susten 400 tablet for 15 days .today cycle day 25 I have back pain and leg pain feeling like period pain and 5 more tablet is there to take .does it mean I am getting period after taking last tablet o what ?normally I have period pain a weak before?