My period is late. My last period was on August 19. I have nausea, abdominal pain, back pain, fatigue, i can feel my heart beat as if there's a pulse on my chest and my stomach. I have 2 negative pregnancy tests but the symptoms i have are wierd. I have been on treatment with Duspatalin for 20 days, I stopped a week ago. could this be pregnancy or side effects of Duspatalin? Please help.