two periods during one month?? SOS

I got my last period July 10th and i just went to the bathroom this morning and i was bleeding again. i have a few cramps but it’s a really light flow. i’m not sure if i may just be spotting or actually on my period. I did end up taking Plan B on July 10th, hours before i got my period. My friend told me I may have just been bleeding because of the pill that first time. but the bleeding was accompanied by ALL of the period symptoms. This time it’s just a few cramps. I’m not sure what this is, is it spotting? is it my period again? I am due for my next period around August 10th because it’s never exactly on time. but this is the first time that i’ve bled twice in a month. i read online that is it normal to have it more than once a month in your teen years but i don’t know. Has anyone else had this as well?