First period? Hormones?

So yesterday was thanksgiving and I was out of town and I went to the restroom had a little bit of brown discharge and a streak of red blood and assumed I’d start my period. Also I am breastfeeding and with my first it took me weaning him for me to get a period. Well I rushed to a Walmart to get pads and all day nothing. Went home had extreme back pain and then some pinkish thick discharge and then nothing! Nothing all night, nothing all morning. No cramping, I’m just so confused. I mean is it just hormones changing? Has anyone else gone through this before?