My breasts aren't sore, really squishy. No other pregnancy symptoms & my period is late. Always had protected sex. Took 2 tests, both negative. What?

Delayed menses. Your period is simply delayed. This does occasionally happen especially if under stress.
Hormonal imbalance. You may repeat the test in 4-5 days, if you do not get a period by then. Use first morning urine and follow the instructions for the test carefully. Menstrual irregularities are not uncommon and anovulatory cycle is a common cause. If you miss more than two periods it would be time to see your doctor. If you do not wish to be pregnant, use contraception all the time. You may consider implanted contraceptive or an IUD. Consult this site for more information on this topic. Practice safe sex. Get HPV vaccine.