What could be wrong?

My boyfriend and I haven't been the safest when it comes to our sex life. We recently moved into a new apartment so things are a little stressful but nothing more than I've been for a while. Things have been stressful for a while but ive nevwr been late. The problem is, I'm 6 days late. I've taken 4 tests now and they are all negative. I've even used the first morning urine to test with. Still negative. How long should I wait before I test again or what should I do because I'm so lost here. I'm completely ready for a baby, if I were to be pregnant. Excited actually.