Brown period lasted 2 days neg hpt

Hi Guys

So im on Yasmin and basically missed a few days of the pill, not on purpose. I normally have a 5 day period which is red sorry for tmi. 

On this ocassion i had a period but was brown and so light i think i used 2 pads n 2 tampons for those 2 days.

Took like dozen hpt but all negative. I dont have any pregnancy symptoms but im so confused.

Anyone been through this before it would be great to hear it from someone and their results.

xxxx Help xxx