Question for breastfeeding ladies(long story)

Katie
Okay I need some answers. Lol my 7 month old is basicly EBF she does eat solids for dinner and breakfast. While I am at work I pump twice. My question is 10 days before my period was due I wiped and there was a little bit of brown blood. So I thought my period was coming early. Well nothing else happened. No more blood or anything. Well I am now 5 days late. For the last 4 days or so I have been having irritable bowels every morning. And have been extremely emotional. I took a test at around 11am and it was negative. It wasn't my first morning urin but figured it really doesn't matter. What do you ladies think? Probably just breastfeeding causing my periods to still be strange?