Freaking out......

Yesterday afternoon after no signs that AF was coming (her being due the 28th) I went to the restroom and when I wiped I had pink on paper and assumed it was just AF showing up early and ruining my hope for a baby this month. I went about my normal routine and used a tampon, but when I went to the restroom later before bed I went to change it and there was barely anything on it. A very small amount of brown.. So I put on a pad for bed to see if it would come as usual and when I got up this am there was nothing.. I used the restroom and again when I wiped I had pink so I got another tampon but again after a few hours I went to the restroom and there was only a small amount of brown on it and it hurt to take it out because it was so dry.. Is this normal? I know it's not normal for me though. Is there still a chance that I could be pregnant?