Pregnant ?! Helpp

Tested with a doctors hcg pregnancy strip at 14dpo, and at 16dpo then tested with a digital Saturday at 21dpo, all negative, period is still late I have no symptoms at all is my period just very late ?? I NEED OPINIONS / THOUGHT?? Id appreciate it! Also not trying to conceive right now AND also my app says I supposedly ovulated the 4th of July but I got ovulation discharge the 10th-13th and I had sex only one day (the 8th) with a condom on , so that’s why I’m counting ovulation since the 13th of July the latest because I’ve hear sperm can live up to 5 days so that would make the 13th the last day🤔 what do you girls think??😰