Pregancy questions

So I have been having some sighns of pregancy for the last month now I just had a missciarge 2 months ago and after about a month I had my 1st period after i belive I ovulated and I belive that's when the sighns like cramping boobs are getting bigger and tummy differences but I didn't want to give my Hope's up so I sat tight and waited then I missed my period which started last week so I'm 5 days late now and I decided to take a test the 2end day i missed and it was 2 positive lines just one was sorta faint then i waited till today and took 2 more and they were for sure darker and positive which now I'm praying for a healthy pregnancy because I want this so bad but what doesn't make sense to me is my belly went from having a little chub after my misscirage but still thin to big and when I press on my belly it feels hard like something is in there but according to my period cycle I'm only suppose to be maybe 4 weeks 5 pregnant so its early so why do you think I'm showing so much or is it just because I'm getting chubby because I really dont understand is that normal at 4 weeks?

Before

Today