If i take my birth control tri sprintec pill before 24hr period does it work after unprotected sex?

Yes: No matter what time of day you have intercourse, birth control pills work if you take one pill a day, every day, all month long. If you miss a pill, you can still catch up by taking it as soon as you remember and then taking the next one at the regular time. If you miss two pills in a row, you need to call your doctor or read the package insert to find out what to do. Best wishes!