So this is probably the wrong section but I wasn’t sure where to put it. Just need some opinions/advice please

Just a little history first. My baby girl (2nd child) is 10 weeks old. I finished bleeding when she was 30 days old. Had been using the withdrawal method (yeah i know, it’s not really affective) and thinking of starting the pill or something for the time being. Was starting to feel sick at night and emotional, felt similar to how I usually feel when pregnant but I was really hoping I was just imagining it. Did a test and it came out negative. Then the next day got my period. Was a little relieved. My period lasted for 6 days (as usual) but was a lot lighter than usual and I had no pains (which isn’t like me). Coz it was my first period since giving birth I was expecting it to be heavy and painful.

Anyway...period ended on Monday (the 11th) and on Thursday I noticed some brown discharge on my panty liner. Kept checking throughout the day and when I wiped I would see brownish/red. It’s still happening today and I have been feeling nauseas on and off (not to mention tired and moody). I thought it seemed like implantation bleeding but is that possible coz I had a period just a few days before? Even though that period was kind of weird.

So what do you guys think? I'm confused :S

Thanks in advance.
UmmAadam