Okay so where to begin lol

I gave birth on the 18th of may to my second child. Normal delivery etc just early like his older sister.

I bleed for about 4 weeks (now I can't remember exactly as everything at the start is a blur😂)it then seemed to stop for a few days then start again so I assumed that was my first period as I was getting bad cramps as well. But I'm so so confused now as bleeding ended completely around the start of August. I still haven't bled this month but I've had so many pregnancy symptoms such as nausea, on/off cramps, twinges/pulling in uterus, sore boobs, feel more tired, metallic taste, food tastes odd, hip/lower back/top of thigh pain. I took yet another pregnancy test today and it was negative again! I'm so confused as to what's going on!

Also for the past 2/3 weeks I've had a lot more heavy white/clear discharge to the point I'm having to change underwear nearly every time I go to the toilet cause it feels horrible sometimes I even think I'm bleeding because I can feel it coming out (tmi sorry) now today it's changed to a more clear watery but a tiny bit stretchy and still the same pains etc what does this mean?