19 dpo but negative tests

Mla

So i took one test yesterday at 18 dpo, cause my period has not showed up yet.. me and my bf did have sex during the day i was supposed to ovulate.

The test ia coming back negative...

I don’t have many symptoms except for peeing often and beings tired. But then again, im always tired...

My sister did not get a positive test with hers for a looong time...

Help!! This is driving me crazy..