HELPPPP

I took a 6 days early first response test today around 5:30pm and the line popped up not even a minute into the three mins. It was dark at the three minute mark. I had been taking the dollar general cheapies and have been getting faint lines. I took my first one Friday January 20th and it was super super super faint, they seem to be getting a little darker but not super dark. Is that something to be concerned about? As long as there is still a line I should still be okay right ? I’m 4 days late today, i ovulated January 5th. According to the app I’m 4 weeks and 5 days.

I know some test are more sensitive but I don’t want to worry about something if there’s nothing to worry about! I haven’t bled any but had the occasional cramp.