I missed one pill

So yesterday (Wednesday) around two I realized I had forgotten my pill from the day before (Tuesday) and I took as soon as I remembered.

I usually always take my BC around four, so I took the one for that day at the right time. Not two hours later I started to have a really bad stomach ache and I figured it was because I was hungry. I finally took a little nap and after I had woken up my stomach was in knots and I had thrown up twice in less than 3 hours.

Could my stomach have been so upset from two pills in one day that it made me throw up? I think it also had to have something to do with this new diet.