Pulling/stretching in abdomen?

For a week now I've been having a pulling/stretching feeling in my lower abdomen/pelvic area. Last Thursday I had sharp pains (by my right ovary) so I went to the doctor and they did an ultrasound of my uterus, ovaries and Fallopian tubes and they are fine. I did ovulate last week and I read online some women experience this as an early pregnancy symptom. Has anyone ever experienced this? If so what did it turn out to be? I do have other symptoms that could be associated with pregnancy as well. (The sharp pains occurred first and the pulling/stretching has been occurring ever since then, they aren't painful or uncomfortable just enough for me to notice them.)