thank you for your query.
it seems you are experiencing irregular periods
and prolonged bleeding called as menorrhagia
.this occurs in cases of hormonal imbalance,the progesterone
shot was to induce progestrone
hormonal levels to come to normal.Norethisterone
is a progestogen hormone. Progestogens are hormones that sustain the lining of the womb (uterus). Normally at the time before a period there is a fall in the level of progestogen hormone in the body. When it falls below a certain level, the lining of the uterus is shed as menstrual period. By taking norethisterone tablets (progestogen) the lining of the uterus is sustained
and hence there is control in menstrual bleeding.
it is not serious condition as of now but needs to be monitored and medication should be taken at regular intervals.
wishing you good health