Pregnancy possibilty?

I missed a bc pill in my pack, the very first pill, becuz I dropped it down the drain. I didn't take a pill at all that day and the next day I just took one instead of two. I was also taking an antibiotic, z-pack for 5 days and then 5 days afterwards for my bronchitis. Well I didn't feel better so the dr prescribed me strong amoxicillin but it made me feel sick so I quit taking it.. I only took like 3 pills. My hubby and I have been having unprotected sex every day this whole month and he has not ever pulled out. What are my chances of being pregnancy?