horrible migraines and body aches!

Hey everyone. I really need some help. So I got my period on may 8th to the 11th. The very first day I realized brown spotting on the right then the blood was lighter and then got darker for the next few days.  After I realized the spotting. I got rushed to the hospital because the cramps were HORRIBLE!! So I see the doctor, explain to them in three days earlier than my actual period and of course the question I received was " Ever thought you may be pregnant"? I said no. So they ran blood test and even took a urine test. Once I took the test the ultrasound tech came in and did stomach ultrasound. she said she wasn't able to see anything because I was bloated. She said my bloating blocked everything so she then did a vaginal ultrasound. Still nothing , a few minutes later , they came and told me that it's just premenustral cramps. So I lef and couldn't help that there was something else. Something wasn't right. Note, I've never been pregnant before so I'm in complete oblivion I had mood swings after my period and nausea not so much and two days ago from now, I witnessed strinkingly painful needle stabbing headaches (migraine) . this headache really took control and on top of the headaches, there was back pain, had the chills, neck pain, blurry vision, front and back pain and I used the bathroom frequently throughout the day. So I really need help, I want to know if I may be pregnant.