Pain in an arm and leg on the same side of the body is termed:

Hemiparesis, or unilateral paresis

Explanation:

Hemiparesis, or unilateral paresis is the terminology used when one side of the body is suffering from pain or stillness or weakness.

Hemiparesis  is a problem arising from the neural disturbances. It happens when the spinal cord is not able to send or receive signals or is unable to sense anything. The portion of the body affected by this problem usually suffers from stroke or pain .

the level of progesterone is low at the pre-ovulatory phase of the cycle but it gradually increases and the levels are high at the luteal phase. if pregnancy occurs, the level of progesterone will be high throughout the pregnancy.

if egg is fertilized and the mother gets pregnant, progesterone starts preparing the uterus for the implantation. it starts building up the lining of uterus and make it hostile of the period of pregnancy.