Just built a house out in the country. Hired a good concrete man to pour the slab. Beefed up the slab, used #5 rebar and 24 inch deep beams because the ground was all clay and I was a little concerned about the ground movement.  Didnt rain for about 3 months and it was hot…real hot. then we got a  4 inch rain and I noticed one of my french doors started rubbing at the top. Also, I did the stained concrete floors and the guy came out to clean them and seal them…when I saw the floor so clean, ( I had them covered for the duration of the construction), I noticed alot of cracks..just hairline  but enough tomake me worry. My concrete guy assures me that cracks are inevitable..but then the door rubbing has me worried…I havent noticed any cracks in the sheetrock..wouldnt that be the first to show…am I being paranoid?  I mean, the slab was poured correctly..I was there. Everything was done by the book and then a little extra was added. Did the ground swell from the rain and tweak my slab?..thanks!