Is this normal for someone with a usually normal flow?

I have such a light period it’s unreal! Not even filing a tampon (tmi) this is not normal for me! I noticed a pink colour when I wiped on 3rd jan then my period started (11th jan) , but only when I wiped and it’s still the same! With some brownish/red strings (tmi again!) on tampon!

I did take a test but it came out negative! Although had some feelings of nausea after eating, complete mood swings, dire thirst and tiredness the week before period was due .. am I going crazy? Haha

I’m having really bad cramps now but still incredibly light flow!