What Causes Abdominal Pain After Undergoing IVF?

Hi, I had my first failed IVF. 5 days after blood test I got my first period after IVF. It was unbelievable pain I almost called 911, pills couildn't stop this pain. During two weeks after period I still have pain in my ovaries, I feel like Urinary tract infection and pressure in lower abdomen. I have to say that I started for first time the birth control pills as my ivf doctor recommended for second try of ivf. Is it normal to have this pain after ivf? Do I need to be worry?

Thank you,

Helena