pregnant?

hi! I'm really looking for serious advice. so on the 27th and 28th of December my SO had unprotected sex he pulled out with one. Then the second time he came but he didn't think he did so when he pulled out it was everywhere but he said it happened AFTER he pulled out. Well now I'm 5 days late on my period. I woke up this morning with a little brown discharg. I ended up taking a pregnancy test this morning anyways and this Is what it looks like.

I can see the LIGHTEST blue line that makes the test 'pregnant' so I was wondering have any of you guys had this problem with a test? Did you just take it as negative?