I had my period in the 21st can you tell me my ovulation date will be and what's my cycle?

14 days b-4 period: Typically you ovulate 14 days before your period and so if you are regular, for example it happens on the 24th of each month, then you likely ovulate 14 days prior--or the 10th. No one can tell you your cycle except you. If you are on the pills, then your period is likely very regular, but lacking ovulation--what the pills do. Consult doc. Good luck.