Is this normal, fellow moms?

Hi ladies, I'm almost 6 weeks now. This is my fourth pregnancy, and I have to be honest, I've always had it pretty easy during my pregnancies so far; not much nausea, and hardly any complaints at all.

This time is different... I'll spare you all the whole laundry list of complaints, but what's important to me is that I constantly feel this tightness in my chest.
I feel so weak, tired, and my head feels super light. When I stand up it's really bad, but even when I'm sitting!!

Is this normal? I have my first appointment with the midwife in 2 weeks...

Thanks in advance!!