1st Tri woes: it's not hip!

Hey all! I have been much more sick earlier in this 2nd pregnancy. I am 6.5 weeks in and I am so fatigued. I have been sleeping non stop for two days. I am up in between for about an hour at a time.

Is this something others have experienced? My first pregnancy was not like this. I was tired but needed only a single nap.

I have also got some severe hip pain since week 5 that seems muscular. It seems early to have any round ligament pain or sciatica.

My HCG went from 15400 to 38000 in the last 5 days. So while it's in routine levels I am suspicious of the possibility of twins.