Help! Pelvic Pain/Ultrasound

Last week I started getting a really awful cold, I then noticed my pelvic area (under my belly button) started aching, and sometimes having sharp shooting pains and I have had awful backache, this has lasted for 5 days now (I am not ovulating atm as that was supposed to happen last week). Anyway, I have booked myself in for a private ultrasound scan which is happening tomorrow, so that I can put my mind to rest. 4-5 years ago, I found out that I had a Chlamydia infection, which was cured and I have done loads of retests since then and they have all come back negative, I recently did one a few months ago and that also came back negative. I am so scared that I have PID or something. Has anyone had similar symptoms and found that it was nothing serious? Can you get PID after you have cured Chlamydia? I am so so scared, I want tomorrow to be good news :( thanks in advance.