I started my period on the 24th and it ended on the 28th I had sex on the 30th and we are trying to conceive is there a chance I could be pregnant ?

If you tend to ovulate on the early side, and plenty of women do, yes, there is a chance. If you are talking about the 24th, 28th, and 30th of this month, it would be wise to continue to keep trying throughout the next week and a half as well. Good luck!