Did your period change after being pregnant?

LO is 8 months old and we're still breastfeeding/pumping several times a day. I got AF back in January and it was normal. About 3 weeks ago I got what I thought was AF again. This time I've been very, very light spotting since then. Is this normal?

Before LO, I was super regular in when AF showed up and how long it lasted. We want to TTC at the end of summer so I'm hoping to get things somewhat figured out soon.