Confused! Is this normal

I haven't had a period since 2012. We found out we were pregnant November of 2012 with our first child. Then found out we were expecting our second when our oldest was 12 months. Then found out we were expecting our third when our middle was 12 months.

Between breastfeeding and three back to back pregnancies I went a long time without a period - obviously I ovulated though.

I started my first postpartum period on the 26th - the 3rd.

But last night I had what I thought was watery discharge, only it was more like brown spotting / maybe mixed with watery cervical mucus.

I can't remember this ever happening before. Is this normal ? I don't know . 🤷‍♀️🤦‍♀️