Is it normal for a period to change monthly and or have 2 in 1mon

I've tracked my period that way as well and in comig up with 41days which isnt normal right?

Yes, what you are experiencing is normal. Women's cycles are commonly referred to in "months", but in actuality, our cycles are tracked by days. A normal cycle is between 28-35 days (average range), and if you do the math, most months have 30 or 31 days...and eventually, your period may begin on the 1st of one month, and then again on the 28th of that same month. Technically...those consecutive periods are in the same calendar month, but what matters is how many days apart your periods are (referred to as "cycle length").

To calculate your cycle length, you count "day 1" as the first day of bleeding. You count every day consecutively, whether you are bleeding or not. Then, your next period starts over with "day 1", and the number of days in-between is your cycle length.

Start tracking your menstrual periods on a calendar, and you will see that mathematically...you probably will have a few period over the years that do occur on the same calendar month.