Spotting or Period?

I never paid any attention to my menstrual cycle. I cannot tell you how many days it usually lasts or how long my cycles are however, I do know that my periods look like dried brown blood. That is all. I don't cramp or feel bloated it's just dry and brown.

After I got married I decided I needed to keep track of my periods in order for me not to conceive. I am still young being only 21 so having children right now is not an option.

Anyways, this is my first month logging my period and I started off the settings with the normal "28" cycle. I was suppose to get my period until the 25 th yet it is barely the 15th. I just had my period like two weeks ago. Is that normal?

Is that just spotting? Or my period?

My cycles are rather short if it is my period then. I am worried I wont be able to conceive later in life when I really want to have a child. May someone please help?

Thanks