Spotting at 5W2D... Advice?

I just discovered I am experiencing brown discharge and/or spotting at 5W2D. My stomach hurts like gas pains not menstrual cramps and I think it is from eating too much fermented food at dinner last night. 
Do the cramps people refer to feel like menstrual cramps or should I be concerned about the fact I feel like I have gas pains along with spotting? I don't have my first appt until the week of Sept 15 and feel concerned. To top it off, I'm traveling for work tomorrow so can't get in to be checked before I leave.