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.
The Content on this Site is presented in a summary fashion, and is intended to be used for educational and entertainment purposes only. It is not intended to be and should not be interpreted as medical advice or a diagnosis of any health or fitness problem, condition or disease; or a recommendation for a specific test, doctor, care provider, procedure, treatment plan, product, or course of action. Med Help International, Inc. is not a medical or healthcare provider and your use of this Site does not create a doctor / patient relationship. We disclaim all responsibility for the professional qualifications and licensing of, and services provided by, any physician or other health providers posting on or otherwise referred to on this Site and/or any Third Party Site. Never disregard the medical advice of your physician or health professional, or delay in seeking such advice, because of something you read on this Site. We offer this Site AS IS and without any warranties. By using this Site you agree to the following Terms and Conditions. If you think you may have a medical emergency, call your physician or 911 immediately.