I had sex 6 days before my periods and next day I got my period is there any chance that I can be pregnant

Having your regular period a few days early is not a pregnancy sign, In , it should have nothing to do with pregnancy what so ever.

Now you had sex, so you can be pregnant, but there is no way at all to tell at this point, Most likely, no you are not, but it is possible to have first period and be pregnant. So you wait till next month and see if you miss that period