No Penetration Dark Brown Discharge

Around January 5th I was intimate with my boyfriend his penis touched the outside of my vagina but did not ever penetrate. There was not any semen present, so precum would be the only thing that could be possible. My last period started December 29th, and my ovulation date was January 12. It seems like I have a longer cycle but my periods aren't usually spot on with the day they should come. It is now February 3rd and I still haven't started my period. A few days ago I had a little bit of brown discharge spotting, but it was only amount and then stopped. A day or two after that I had some creamy whitish pink discharge. Then yesterday I had more brown, but still a small amount. Today I have a heavier amount.  I know brown and pink discharge can be a sign of pregnancy but for me it occurred way more than 14 days after (more like at least 21-23). I took a pregnancy test and it came back negative, but I've heard that they can be wrong early into pregnancy or that it could have been too diluted by me drinking too much water. What are the chances I could be pregnant?

[KeeLolo]

U could be pregnant or this could also be your cycle trying to come.... I have had this happen twice before why, don't know. But if you didn't have intercourse from what u posted when u had sex it wasn't during your fertile cycle and u are sure no precum was present then more than likely you are not pregnant... Only way to be 100% positive would be to go to your ob and have a blood test done.... But it sounds like you are in the clear.