No, if that is normal for you then you are fine. If you all of a sudden went from 28 days to 21 then something is wrong.
You have your period a fixed 14 days after you ovulate. So if a woman has her period every 21 days, she ovulates on 21-14=7...the 7th day after the 1st day of her period.
Yes, it is normal to have a period every 18-21 days but it is a short cycle. A typical menstrual cycle is 28 days and everyone is different, but a shorter cycle may imply possible fertility issues in the future so if your cycles continue to be this length and you want to TTC talk to your doctor.
absolutely.
Cycles can vary from 21 to 28 days or longer depending on the indivdual.. You have been off the pill for a while, and if the cycle is continuous, this may be your cycle.
It's 21 days not 22.... cuz 7+7+7 (3 weeks) is 21 Because it takes it 21 days to "fill up" and 5 to 7 days to "empty"
it isn't normal but it isn't a problem you have to worry about periods for extended days most likely show when you are a active person and do sports or physical activitys.
Sometimes people have irregular period which can come either early or late.
Mice are pregnant for about 20-22 days, which is approximately 3 weeks
Every female is different, thus every period is different. 28 days is the average but it could range from 21 days to 40 some. you can always expect your period 14 days after you ovulate. you may not receive your period every month since exercise, weight, and age may also affect it. Most women get their period for about one week out of every month. you should get you period every 28 days.
The gestation period for mice is approximately 19-21 days.
Angus cows or heifers come into heat every 21 days.