While those CAN be an indication of pregnancy, they are not enough to diagnose one. If you feel you are pregnant, the best thing to do would be to get a FRER preg test and take it first thing in the morning. Those can also be signs of many other things.
Ovulation occurs about 2 weeks before your period. If you had sex on the 12th and got a period four days later then you are not pregnant. Especially if you're having negative pregnancy test results. If a baby isn't something you want in your immediate future abstaining from sex is the only way to prevent pregnancy (and STDs).
A blood test is around $50 in my area so if you want the security in knowing the test would be accurate. A blood test can detect pregnancy just 10-12 days after ovulation.
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