15 mo PP, no period, no BFP but having symptoms

I’m 15 mo pp still nursing so I haven’t had my period back yet. My hubby and I BD around 12/22 and around 12/30-31 I had some spotting. Haven’t had any spotting since before I was pregnant with last baby. I’ve had a lot of light cramping for the past week. Yesterday I was utterly exhausted and started feeling like I couldn’t quench my thirst at all as of yesterday. Oh and I’ve had more clear discharge which isn’t normal for me. These are all symptoms I had with my previous pregnancies.

I have no clue when I ovulated so not sure when I should test and expect to see accurate results. I took a target brand on Wednesday morning and a cheapy Amazon one today when I got home from work and both were neg. Any ideas?