Knee suddenly swollen. Can’t remember slipping or getting hit. 内科or整形外科

Yes, another doctor question. Apologies beforehand. Knee is suddenly swollen, pain has been escalating this past week, decided to go get it checked out. However, I can’t seem to find the right specialist to see. Should I go to a 整形外科 or should I play it safe ang do to a 内科？