Low milk supply pregnancy symptom?

Sa

I’m breastfeeding my 7 month old and noticed my milk supply has completely tanked in the last few days, could this be a sign of pregnancy? Like I used to pump 28ish oz of milk a day and today I was able to pump a total of 10oz 😐.

My period is 2 days late, took a FRER test today and it was negative. I got my BFP at 12 DPO with my first so I don’t know what to think 🤦‍♀️

I’m also cramping a lot, exhausted and nauseous in the evenings- just like with my first.