Chills and hot flashes in pregnancy

I am 24 and currently pregnant, but only between 5-7 weeks ( not sure till my ultra sound) my period and ovulation is all messed up.

Anyways, I’ve been feeling nausea through the day, especially after I eat but haven’t thrown up, I have sore nipples and fatigue. But I’ve also noticed I’ve randomly been getting the chills and then hot flashes and then chills and then get really hot. And so on.

Is this normal? Anyone else have this in first trimester ?