Can you get pregnant right away after completely stopping breastfeeding?

When I went back to work my milk supply was low. I was only pumping 3-4 times a day to twice a day until I stopped. I stopped pumping the beginning of dec.

I got my period which was light, in sept. And had a heavy one in Nov. but had spotting dec 10th, then stopped that day. Then I had what looked like implantation bleeding on January 3rd.

I took a pregnancy test 2 days ago which came back negative.