Could I be pregnant?

My cycles have always been irregular. Sometimes they'll come on different days, sometimes my period will be shorter. My boyfriend and I had sex August 23, the last day of my period. Which I really didn't bleed that much, just spotting. eve said I ovulated August 28. During that time, I had this small dot of red/pink discharge. Here recently, I've been experiencing sore boobs, nausea, head aches, cramping, dizziness and heart burn. Am I crazy or?