not at first, but into the first trimester it will get hard. Your uterus creates a lining that does not shed; which is called your "wall".
Nothing
Its not hard at all. When in heat they should be able to get pregnant. Sometimes on their first time they don't get pregnant. But that's rare.
Getting pregnant is very hard or very easy depending on how easily your body conceives
Sure.
Constipation usually have other reasons then pregnancy but the only way to be sure if you are pregnant or not is to take a test.
Yes. There is nothing wrong with laughing while you are pregnant!
yes
Your stomach gets hard around the 5-6month.
yes it doesnt do anything to you
Yes
The blood type has nothing to do with getting pregnant.
Your pubic bone is always hard, it is a bone, bones are hard, nothing to do with being pregnant.