Somebody tell me something!!!

So I had sex with my bf December 28-29,2018 I got my (period?) January 16-20,2019. I was expected to get it again (period) feb 13-17 now nothing. There’s no possible way I can be pregnant and I did test on the 2nd day at night time that I was late. Negative (thank heavens) but my period didn’t come yet! Does anybody think I can be pregnant? SN: my body does weird things 😩 super nervous now I’m 6 days late!