Need some advice...period or no period

So according to my app it says I should start my period today. I had no symptoms of AF this morning. Then around lunch time i had a slight crampy like feeling then I started to spot some blood. So I used a tampon because I thought period was starting.

Normally I have severe cramping, severe back aches, and a heavy flow. Later this afternoon I took the tampon off and had a little on there. Then I just realized I’ve only been wearing a pad for the last several hours and I have nothing on it. I have no symptoms right now.

What do you think this is? Is it my period or not?

Thank you for the advice.