Pregnancy symptoms

Amber

I am 4 months postpartum and have been having pregnancy symptoms that seem to be pretty strong. The nausea, fatigue, frequent urination, and bloating are all there. I have taken many pregnancy tests over the last few weeks and all have been negative. I am breastfeeding and have not had my period yet but after my son it took over a year for me to get it again. Has anyone had pregnancy symptoms this far after delivery and not been pregnant?