Pregnant after Pregnancy?!

I just had my son 6months ago and since then finally got my first period post partum. My second period was supposed to come July 7th. On the 5th I had brown discharge then experienced Slight cramping and put a pad on bc I expected my period to come period to come. It didn't instead I had the discharge for 3 days then GONE 100%. Since then Feel these weird symptoms but idk if it's my mind playing tricks??? Took a pregnancy test the 8th and it was negative. Now I'm having a lot of white discharge.. Which is weird because I don't get it like this? I'm scared to take another to see it say no :( so I've been Debonking it my self. HELP