Guidance Needed

I haven't had my period since October 10th on the 28th of November I felt a sharp cramp on one side of my body that had me doubled over but I chalked it up to eating too much Thanksgiving dinner, I felt better after lying down. For the past couple of nights, I've had cramping then last night I had really bad back pain and couldn't sleep due to not finding a comfortable position. I called my doctor this morning and they told me to go to urgent care to get the proper tests done? (even after I told them that all my hpts were negative). when I texted my mom about it she told me " Awesome. It's probably just your imagination and nothing is wrong. I think you should wait it out." So at this point I really don't know what to do, I don't want to go behind my mom's back and not take her advise. Could she be right? I need support and guidance.