I don't know if I was having periods for 7 days. I took birth control …

I don't know if I was having periods for 7 days. I took birth control pills but after my period, I didn't take the pills a few times because they made me feel bad. And suddenly, I felt like something was down in my stomach. When I sit down, it feels like someone is sitting on my bladder and there were frequent urination. Could this be pregnancy? Because when I press down on my belly, it hurts.