I'm sorry about this..

I need to ask a tmi question

I was getting regular periods but then me and my partner had sex and the condom accidentally split! I'm now a week late but I did a test 2 days ago and it's was negative. The accident happened 3 weeks ago so if surely would of been positive if I was?

I started like really really lightly spotting today, like it was a tiny bit of brown blood and it was only there when I wiped twice. Is this my period coming? I don't feel like AF is coming