Is this my period?

So, yesterday I was having the Worst. Cramps. Ever. I couldn't even move, so my mom got me a hot water bottle, and that soothed the pain. She then gave me an ibuprofen, and told me to go to sleep. I went upstairs to go to bed, but I went to the bathroom first. When I was in the bathroom I noticed that there was reddish stuff in my underwear, and I immediately guessed that it was my period. So, I immediately put a pad on and went to sleep.

But, when I woke up in the morning, there was only a few brown smears, covering only a 1/3 of the pad. I'm not sure if this is my period, or just weird discharge?