NEED ADVICE PLEASE

so i had sex twice with my boyfriend 1/28 (we used protection and he pulled out both times) and my period was due 2/1 and now it's 2/5 and it's still not here. My period is never late so i'm really worried. I took 3 pregnancy tests two 2/3 they both said negative and one the next day as soon as i woke up it also said negative. Is there still any way i could be pregnant ??? Or why is my period still not here ? any advice would be great