pregnant, how big is the chance actually?

Hi, I have a question. I've been searching for an answer for days, but unfortunately, I haven't received a response to my exact question yet. I'm on the pill. I still have 5 pills left to take and have already taken 16. After the pill-free week, I forgot my first pill. I only realized this late the next day and restarted on day 1. Normally, I take my pill in the morning, so technically I'm 1.5 days late. I've had unprotected sex every day because I only recently found out that it's possible to get pregnant. I've been having a lot of headaches, sore breasts, heartburn, and extreme fatigue for a while now. I'd like to go to the doctor, but I want to know first via this forum if I really have a chance of getting pregnant. I hope someone can give me a good and clear explanation. Maybe some advice too. Greetings, Maria.