There are NO EARLY SYMPTOMS that are exclusive to just pregnancy. If pregnancy hormones aren't strong enough to show up on a test - they are also not strong enough to be causing all those symptoms.
Any change in your hormone balance can trigger symptoms. Other things can trigger some symptoms. (headache, nausea, back pain, and fatigue are also all symptoms of being sick.) When you are having issues with nausea, food aversions can happen just because of the nausea.
How do you track your ovulation day. If you are using an app - that is only an estimate and ovulation might have happened earlier or later than the estimated date the app gives. If you are actively trying to conceive, and you want to use an app to track ovulation, you need to assume that the app is not 100% accurate and be sure to have sex during the time frame that the app shows as "fertile days" as well as trying for the predicted day of ovulation. If you are only having unprotected sex on the day of ovulation, and the app gets it wrong, you could be missing your chance each month. The egg only lives for 12 to 24 hours, so if ovulation was a day or two early, you missed your chance. Be sure to have sex as often as possible for the week before the app predicts ovulation. Sperm can live for up to five days and it will increase your chances of becoming pregnant. Or - you could track nothing and just have sex often.
Even when you have sex on the right day, there is still only about a 20% chance of becoming pregnant. Even when conception happens, sometimes implantation fails.
Give it a few more days and test again if the period doesn't happen. Be sure to follow the test directions.