Spotting and majorly bloated tummy???

So I was spotting only a little bit today a dark reddish brown and 2 days ago it was less than today but still spotting. I missed a pill like a week ago by 6 hours. I never forget to take them on time and I've been on the pill for 5 years. I'm also extremely bloated and have a puffy tummy. Webmd said its IBS or something to do with bowels but I'm wondering if it is part of the spotting? I'm supposed to get my period in 7 days. I'm nervous I'm pregnant?? I don't think I am but advice??