Spotting but no periods

aspiring

We have been TTC for last 2 months I am 14 days late for my periods this time

. My last period was on 1st Jan and I have 35-37 days cycle. I have been spotting dark brown blood since Cycle day 45 but no red blood or period. Took pregnancy test today but I am not sure if that's a faint line or anything. :/ Any suggestions? Should I go see a doctor?