My period is nine days late and I've taken four pregnancy tests in the past month and they all came back negative Help?

That happened with me with my second daughter. I took four of the store brand tests, and they were all negative. I spent the extra money and got one of the more expensive ones, and it came back positive. Try switching brands and see what happens. If you still aren't sure, go ahead and make a doc appointment. In truth though, even if you aren't pregnant, if you are really stressed over the possibility, it can cause your body to keep delaying your period.