Missed period.....

girl

So I’ve missed my period for about 18 days now. My last period didn’t even feel like a period. It was more just like spotting for 3 days. I took a test but I don’t think I did it right or maybe it was a bad test from the start because it had a line through it already so nothing changed. I’m starting to kinda get nervous but I keep telling myself that I’m not pregnant.