Is this normal so early on? Confused and worried

I am 6 weeks and 4 days and all week I have been seriously weak and out of energy, not to mention out of breath and sore. Even just walking 5 minutes gets me out of breath or even moving around lots in some other way, my legs seem kind of in pain almost instantly and I just generally feel too weak to do much. Surely this isn't normal this early on? I'm trying to battle it and continue moving but I have never felt like this before and it's definitely a confusing struggle.