Birth control to line treatment up

Hayle • 5 yr old daughter. 1 👼🏼 1-23-19. Ttc baby #2.

I need some help. Some insight husband works in the oil field 2 weeks away 2 weeks home. My miscarriage cause my period to happen when he’s home causing treatment to happen when he’s away. I’m on birth control for only a week-2 weeks to switch my cycle up. How long after stopping should I expect withdraw bleeding? I need to bleed before April 17th probably about 5-6 days before that. Having a hard time figuring out when I should stop the pill.