am I pregnant?

me and my boyfriend had sex on Decemeber 29th without a condom. so then I took a plan B pill the next day. we had sex again without a condom on January 7th without a condom but this time I didn't take the pill. I took a pregnancy test the next day on the 8th and another one of Monday the 9th. both came out negative but Glow said my period should've came on Sunday the 10th and when it didn't come it said it should come on the 12th, I still didn't get it so then it scheduled it for the 14th. I'm so scared, could I be pregnant even though both tests came out negative. I was also ovulating the week of Decemeber 20-28