help!!!

So I was three days late on my period was supposed to get it June 5th and got it on June 8th now every single month I have gotten my period on Monday all on time never once late, normal 28 days since October. I got my "period" yesterday and it's normally very heavy and these past few days it's mild/light on and off. My mother in law is a nurse and told me it's too soon to take a test and wait and see this would be my first time I have no children so I am not quite sure what I should expect or if this is normal. Has anyone had the same experience and end up being pregnant or not pregnant.