Scared...

So I have been on the pill since April 23rd and have made sure to take it every single day, sometimes late. I recently lost my virginity and have had sex twice since the first time with my boyfriend and we have used a condom each time, but ever since then I have been cramping and I have been so scared about getting pregnant. Can anyone tell me the symptoms of early pregnancy? Or is it just me worrying about pregnancy after losing my virginity?