could I be pregnant ?

Ty
I've been with my partner for nearly 6 years and we've decided we wanted to start trying for a family. I've recently come off the  
contraceptive pill (Yasmin) last month the begining of December. i stopped once I finished the whole pack then I had a normal withdrawal bleed since then I've been having unprotected sex with my partner, according to glow I was meant to see a period yesterday but still haven't come on. Is it possible that I could be pregnant or has coming off the pill just messed up my periods ?