Ok I was supposed to start my period on the 23 and I took a test on the 24th... it came back negative... Could I still be pregnant

Possible your period can some times affect the results of your pregnancy test talk to a doctor did u have sex at the least 2 or 3 weeks earlier if you did go to a doctor if you didn't don't even bother

Yes, you could still be pregnant, it just may have been too early to tell on a test.

If you haven't started your period by now, test again in the morning and follow the directions carefully.