No.
They are not signs of pregnancy, but you may be pregnant and have them.
The menstrual cycle is the entire reproductive cycle - I think you mean during menstruation.Yes, a woman can practice yoga during menstruation, in fact some poses can be very beneficial to menstrual health and ease menstrual cramps.
The menstrual cycle is where the woman release an egg. If the egg is fertilized, she will become pregnant and produce a child. The menstrual cycle is important for human reproduction.
Yes.
Your pregnant
When you become pregnant, your menstrual cycle is delayed for next ten periods. That means you will not get menstrual bleeding till delivery.
If you were pregnant then you'd no longer have a menstrual cycle, if you don't understand that then you should in no way be having sex or sexually active to risk pregnancy. The menstrual cycle is your body preparing for possible pregnancy, when pregnant the cycle is shut down.
You prepare by making sure that you have all the menstrual products that you need. Options include menstrual cups, menstrual pads, softcups, and tampons - make sure you know your options and know how to use them correctly, be sure to have all you might need for menstruation. If you suffer from problems like menstrual cramps dietary changes leading up to menstruation can help prevent cramps, also make sure you have painkillers to treat menstrual cramps.
These include amenorrhea, or the cessation of menstruation, menorrhagia, or heavy bleeding, and dysmenorrhea, or severe menstrual cramps.
If the egg is fertilized and results in pregnancy then the menstrual cycle stops. The menstrual cycle exists to allow pregnancy to occur, so when pregnant no need for it to continue.
yes
One way to know if you are pregnant is if you have missed your menstrual cycle.