I Need help

I’m on birth control (the pill), and I take it the same time every day. I haven’t missed a pill in MONTHS, but I’m late by 4 days. I just recently started a new birth control. This is only my second or third round of it. My period usually starts three days after it’s supposed to, but it’s the 4th day and I’m not bleeding. I’m supposed to take my next pack tomorrow. ( my birth control pills do not have placebo pills. Instead, the instructions are to wait 7 days after finishing a pack before starting a new one. I usually only wait 4 days) I had sex without a condom, and he didn’t cum in me. We also had sex during these 4 days. Do you think I could be pregnant?