What are the chances of getting pregnant?

My boyfriend and I had sex last night. We used a condom. We then had sex again, but he has just used his last condom so we didn't use anything. I have just started the pill last week, but I forgot to take it yesterday. Are the chances of getting pregnant high or low?
(By the way, I had just ended my period and Glow said 7% chance, but I am not sure if that's accurate or not)