I can't believe the software deleted the word s u c k s in this context.
(Please look at a drawing of the female anatomy for the following to make sense. Usually, the uterus is in the middle, looking like a pear with the wide part at the top, and the tubes sticking out to either side at the top.)
The tubes go up out of the uterus toward the ovaries. Downward, below the uterus, is the vagina. When a period comes, the tubes are not impacted whatsoever. They are above the rushing of the fluids, so to speak: it all happens in the uterus and downward. The ovaries send signals that the uterus responds to, but the only thing that ever travels from the ovaries is eggs, which float around until a tube catches them with that catcher's mitt-looking end and ***** them down to the uterus. The period is the shedding of a lining the uterus makes once a month. The uterus forms this lining without assistance from your tubes or ovaries, and after a while if the body decides it doesn't need it this month for a baby to rest on, it says "let it go," and it flows down through the cervix and vagina and then out.