What Causes Vaginal Spotting And Headache?

Last month (due to 3 missed bc pills..oops) I started my perioud a week early. It ended aafter about 7 days (as usual) instead of taking my bc pills as soon as it stopped (or at the end of that week after i had my perious) I waited untill the fallowing week to start taking them(so that everything would be back on scheduial). I am due for my perioud this week(so this will be the 4th week with no perioud due to my mix up) But during this time i was sexually active, and missed another pill. I am having bloating, cramping, some slight vaginal spotting when i poop, headaches, dizziness, and slight nasea(which is better after i eat. Is this due to the mix up in my perioud, or could i be pregnant??