We had protected sex with a condom 4 days before my expected period (28th day of cycle) and my cycle is usually regular. Now, I'm a week late (35 days in) and haven't had my period yet. On the 30th and 31st days, I took two pregnancy tests and they were both negative. On the 33rd and 34th days, I took 3 more, all negative. Three different brands of tests (Clear Blue, First Response, Answer). Since I took all the tests after the expected day of my period, they are most likely accurate, right? It wasn't too early or anything?