yes.it may just be your stressing out about it thats causing the tummy hardness. untill i was noticeably pregnant my tummy was still mushy... lol once i was showing then it was firm.
i only had cravings with my first pregnancy. so every pregnancy is different. but if you were pregnant you would of had a positive pregnancy test by now. you can stop worrying about it and enjoy your life. and visit a dr or womens health center to learn about pregnancy prevention options so you don't have to worry about pregnancy till you are ready for it.