Infection?

I’m currently 2 weeks postpartum and starting the night before last I went to bed with what I thought was normal cramping. It kept me up all night and hasn’t gone away since. I’m fatigued but that just may be from being a new mom. I’m nauseous all day long, I can only manage to eat a few bites of things. To make it easier:

• lower left abdominal pain

•nausea

•fatigue

•headache

•chills

Is this normal for two weeks postpartum? I don’t want to go to the ER for nothing. Anyone else experience this?