this could be due to hormonal changes and or if anything else develops see your doctor.
Not at all.
Yes, a womans cycle is calculated from the first day of her period
The bleeding will get lighter and lighter towards the end of your period. bloating will decrease
you will most likely be getting your period.
a womans period should come at an average of every 28 days
There are different causes for having a lighter period then usual. Some causes for this can be stress, diet (eating less then you normally eat), illness (recovering from surgery, becoming very sick, ect.) or having hormonal problems.
Menopause
i think there is because, spotting is usually lighter then a period and the shot causes your hormones to act up. which would in some cases cause some spotting.
Unfortunetly you cannot ):
i know that if you smoke you will have a heavier period and more cramps. Models don't get periods because they don't eat. I know it sounds silly but try banannas they actually work!!
the baby has to devolep in the womans stomach and has to be healthy before it can be born
Roughly once a month, hence why it is called a 'monthly period/cycle'