Praise be to Allaah.
The basic principle is that the blood that comes from the
woman is menstrual blood, so long as it does not last the entire month or
only stops for one or two days (in the month), in which case it is
istihaadah (irregular, non-menstrual bleeding). This is the correct
scholarly view, so there is no maximum limit for the menses.
The menses may increase or decrease, and it may come earlier
or later, or it may stop for several months.
Shaykh Ibn ‘Uthaymeen (may Allah have mercy on him) said:
Some women may remain without menses for four months, then get the menses
for an entire month, as if – and Allah knows best – it is withheld and then
all comes at once. And some women may menstruate for three or four or five
or ten days every month.
End quote from ash-Sharh al-Mumti‘, 1/402
For more information please see question no.
It is well known that the woman who is menstruating should
not pray or fast. As for the woman who is suffering istihaadah, she should
pray and fast, and her husband may have intercourse with her.
Based on that:
What is happening to you now is menses, so long as it does
not last a complete month or one or two days less than that, in which case
it is istihaadah; and take this into account for the following month.
See also question no.
68818 on what to do in the
case of istihaadah.
And Allah knows best.