Uterine contractions are involuntary. That means they not under your control. When you push down, it the abdominal wall muscles, that contracts. It helps to deliver the baby.
Women give birth in one of two ways... The uterus start contracting, forcing the cervix to dilate. Eventually the fetus is expelled through the vagina, which also dilates as needed. By caesarean section, a surgical procedure, where the uterus is cut open, the fetus is removed, and the uterus is repaired.
Yes, during pregnancy the uterus pushes against the bladder. thus the bladder can't hold as much urine and has to be relieve a lot more often.
no
There are no bones in the uterus.
You are probably just having the cramps because your body isn't used to not having your period, although I don't see why you aren't having your period if you are on birth control. You should ask that!
no
Yes
in the stomach/uterus
In the uterus.
has there been any known cases of a women getting pregnant without a uterus
No. A uterus is a home for a baby, containing vital nutrients for it.
When a women is pregnant her uterus expands to 500 times its normal size.