Breastfeeding TTC, no AF yet

My little one will be turning one in two weeks and DH and I have decided to ttc #2.

I am still breastfeeding and have not had a period yet so im trying to figure out if im pregnant or if i’ve started ovulating?

Anyone have any experience with this?

Over the last month ive noticed a drop in my milk supply and i am fatigued... ive taken a few pregnancy test but they’ve been negative.

Any mamas out there get pregnant without a period and still breastfeeding? What were your ovulation symptoms/pregnancy symptoms?