my 5th day of period, can i still take althea day one?

Hi,
Welcome to ehealthforum,
You can start with the birth control pills even if the period you had was induced period (with use of provera). Continue to take the pills at scheduled time daily. You should have your next period/withdrawal bleeding when you finish with the active pills of your pill pack. Avoid unprotected sexual contact within 2-3 weeks of getting started on hormonal contraceptive (as most of the hormonal contraceptives start giving you effective protection after 2-3 weeks). Be regular with birth control use as instructed. Avoid having unprotected sexual contact if you are not ready for pregnancy. Consider being in regular monitoring and follow-up with your treating doctor/gynecologist and report any new/abnormal symptoms immediately. Drink plenty of water. Take adequate rest. Maintain healthy diet and lifestyle.
Take care.