Possible pregnancy?

I was supposed to get my period on may 16 and all I got was this barely pink discharge in the morning, the next day (may 17) it was light pink and kind of brown but I only got that 2 times that day. Now (may 18) I got what looks like a period but I have different felling cramps than usual. I am getting them on my lower back and they come and go, usually they are in my front and they dont go away. Also this would not be my first pregnancy I have a 5 year old and in that pregnancy I had my period the first 2 months. Do you think the same thing could be happening this time?