Am I having an eptopic pregnancy? ?

I have the birth control that is inside my skin it's supost to be for 3 years on March I'm gona have to replace it. I been feeling so tired I sleep alot. I pee alot alot. My stomach gets realy big like if I'm 5 . 6 months preg. My period ended like 1 week ago n I been spotting for 2 days. The back of my neck is killing me. I feel dizzy n I feel like throwing up but I don't. Should I go straight to the hospital or clinic.