I need some advice.

Yoana

I been trying to get pregnant since March, and so far had no luck. This month according to this app and a different app I use I’m 4 days late. I took a pregnancy test 6days ago and it came out negative. The last time me and bf had sex was August 2nd, so I would only be about 3 weeks. Could I be pregnant? Should I wait a couple more days to take another pregnancy test? Or see if I get my period?