First period

Tara
I'm 10 months post partum and I think I just got my first period. 2 days of light bleeding (enough to warrant a tampon each day but did not soak all the way through.....sorry if that's tmi!). Now I just have a general feeling of unwellness, very tired etc. Plus my lower back is hurting a lot. Is this all part of getting my period back?? Did a pregnancy test and it was negative, and I'm on the mini pill, plus we use condoms so hoping I'm not pregnant!