Me and my boyfriend had unprotected sex September.5,6,8,12,13,16 my period suppose to came on September.18 but came on yesterday and I was spotting but today it's a little more blood.. I took a pregnancy test and it said negative. Could I be pregnant?

Doesn't sound like it.

You can not take a pregnancy test until you are two week late on your period. False Neg readings is common if taken too early.

Having a period is NOT a sign of pregnancy, so if you are having a period, you are not pregnant