I'm 6 weeks and 5 days and I've experienced the same things! I'm still going strong and so is my baby :)
I'm 6 weeks. I'm very bloated with minor cramps...so I'd say that it's normal. :)
Back pain and bloating also very normal.
I'm exactly 5 weeks and 5 days also! Yes. Cramping is normal. :-) If you notice blood or spotting that is normal too (haven't expierenced that) but wiser to go in to the Dr.