Was it my period?

I missed the first pill in my pack due to the dr not refilling it on time. I doubled up the next day and had unprotected sex. During my placebo week I had pretty typical pms symptoms and extremely light brown spotting for about 2-3 days. I am now experiencing chest pains back pains and nausea, but it’s hard to tell if it’s from stress due to being in a car crash a week ago on top of worrying about pregnancy or if it’s early pregnancy symptoms. Anybody have any advice? I have a appt with my obgyn Monday and I plan on asking for a test, but my mind won’t stop racing.