Pregnancy scare help please

I had sex twice in one day and he came inside me both times. According to my chart I would have been ovulating the next day. I will be the first to admit I have not been responsible at all when it comes to taking my birth control pills so definitely need a new method. However I am really scared that I could be pregnant although it is way to soon to tell. I habe missed taking my pills at some point every week. this happened on the 6th of January. I'm really scared. I am a senior in high school. I am well aware of how much I have messed up with this whole situation. How possible is it for me to be pregnant with the given circumstances? should I be worried at all?