If my period started on feb 24th and ended on march 4th and I had sex march 15th could I still get pregnant

Why would you think you couldn't.

You can potientially get pregnant any time you have sex... no matter what day of the month it is (even during your period)... or even if you are usiung protection.

Protection only reduces the odds of pregnancy.. it doesn't eliminate them. But that's why you ALWAYS need to use it.

Yes, you could be pregnant. Any time you have sex, even with protection, pregnancy is possible.

You'll have to wait until your period is at least 2 weeks late, then test using first morning urine. If you're not prepared to be a parent, the only way to completely guarantee you won't get pregnant is to abstain from sex.