Breastfeeding moms!

serinity • 👦🏼👦🏼👧🏼👧🏼👶🏻TTC I’m a mechanic and proud of it

I am breastfeeding daughter is almost 6 months. My periods are irregular for almost a week now i have had sore boobs acid reflux and im tired. I havent had a period for a month and a half now. I tested a few days ago and got a negative. Whats going on? Should i test again?