Advice please!!!

I’m on birth control, but a guy came in me about 4 weeks ago. Two days after that I started spotting a real light pink blood, that lasted about a week.

Now I’ve missed my period (nine days late). I took a pregnancy test the first day of my missed period and it was negative, but I’m just kinda freaking out cause I usually have a regular period even with my birth control.

And the spotting was super weird for me.

Any advice? I’m actually terrified that I may be pregnant