Sometimes the uterus will spasm a bit when it detects that semen is present, as it creates internal suction which helps push the semen up into the fallopian tubes. Not all women feel it happening.
They are called contractions, this means you are having a baby! congrats!
An imbalance of electrolytes causes problems with spasms.
These can be muscle contractions or spasms.
mostly stress
toxins
What causes spasms in the front right pelvic area?
My massive penis
When an egg is not fertilized by sperm, this causes the breakdown of the uterus lining. It is known as menstruation.
The oxytoxic makes the uterus to become hard.
Pregnancy.
One might find information about treating muscle spasms at the online site WebMD. They have great details on the causes and potential treatments for these spasms.
The spasms you are feeling are muscle spasms. Muscle spasms are mostly caused by dehydration so you should try to hydrate yourself to stop them.
It is controlled by the uterus. That is where the uterus lining is which causes the menstrual cycle