6 weeks pregnant and feeling so Ill

Hey guys, I am currently 6 weeks pregnant and I feel extremely I'll, I have headaches, a stabbing pain at my rib, feeling constantly sick, high temperature of 39.2 and feeling dizzy if I stand up and even when I sit down. This has lasted 3 days now amd no sogn of it getting better. This is my first pregnancy and my sister's are saying it is just part of being pregnant and I am not sure if I am making a big deal out of nothing, should I see a GO or just leave it?