Implantation bleeding

Aaliyah
Hi ladies,
Could someone anwser this question for me? 
I have been trying to get pregnant for more then 2 years now. But after i stopped the pill my AF was totally gone. Now it shows up like in 4 months once.
Last month i finally got my period after waiting for 6 months! Ofcourse i was totally happy and after that i stopped checking temp etc. I just slept with hubby every other day.
My period was 15 of last month and lasted for 5 days. (So ended at 20th)
And yester when i went to the toilet and wiped i had 1 red spot on the paper. I thought okay maybe AF is out of control again is coming now. Today i had some light brown discharge but just reallyyy light. 
What is happing? I already took 3 preg test and all negative. Or am
I just testing way to early? 
Please post you opinion below! 
It would mean a lot to me.
Lots of love and baby dust to all💞