My boyfriend and I had sex today for the first time. I have been on the pill for 16 days and have taken it around the same time give and take 15mins. However, when we had sex today, we didn't use a condom because it was uncomfortable and he was getting a mild allergic reaction.. he didn't pull out either.. so i was just wondering if there is a high chance of me getting pregnant? I know the pill isn't always 100% effective and you should at least wait for a month, but I just need some advice..

Thanks.