If you got pregnant, you are already close to 21 days after the sex that could have made you pregnant. It is just the way our cycles works.

I would wait a bit, I’m a virgin but I’m 5 days late. It could be from stress

How convenient, I'm 4 days late. Haven't token a pregnancy test yet. Don't know when it's the best time to do it.

Both positive tests I got were from being 3 days late