TD, I had appendicitis when I was 17 weeks pregnant with DS. I had all the symptoms you had for 3 days before I went to the GP who sent me to the hospital. The ob and the general surgeon were stumped because I had no other classic signs such as fever and vomiting - just pain. They decided to take it out just in case, as a precautionary measure I guess because I was pregnant. It turned out that my appendix was actually starting to rupture, so luckily they got it out when they did.

If you are not happy at all with the pain, or get a fever or feel sick, definitely head straight to the hospital.