3 days late

sophie • First time Momma❤️

3 days late. Had sex on tne day i supposedly ovulated according to the app. I have no sign of aunt flow. I have a weird taste in my mouth and a sore back. Took a test today around 7:30 and it was negative. I have another test. I had unprotected sex around 17 days ago. Is it still too early? I know everyone is different but i need to know😭.. can i retest on Saturday? I leave to go to America a week wednesday and i jus need to know