Please help! Pelvic pain, not pregnant but ttc

Staella
So ive been off birth control for over a year now and my husband and have been ttc. Ever since coming off birth control I've had pelvic pain. But it's not always during ovulation, some days it's worse than others, sometimes I have lower back pain associated with it AND it almost always last for several days, not just 1 or 2. No bleeding or abnormal periods, no fever or nausea. I've had blood tests and ultrasounds done which all came back normal , but this just doesn't "feel normal" . I don't know if it's because I was on bc for so long (probably 12 years or so) , or some other underlying issue but it worries me because it's so frequent. Any help would be greatly appreciated!!