Is this normal?

I'm very new to all this period stuff so sorry if this is stupid lol 
 So next week will be my fourth period, I'm 13, but the thing is my period is really light.
Literally just like three drops of blood. I usually don't cramp. But I'm pretty sure it's my period as it happens when this app usually tracks it to. On my third period I did cramp a bit, but it was still really light.  Should I be worried?