Is it normal to have strong abdominal pains in 12th weeks of pregnancy?

Jenny

I am 12 weeks pregnant and today I had a really strong and extremely painful cramping feeling in my abdomen accompanied with nauseating feeling, It is still paining, but not as bad as it was in the morning. Is it normal? Or, these symptoms may be pointing to some kind of infection? I am a bit concerned, and looking forward to some serious answers.