3 days late. TTC

So af is 3 days late. I have taken 3 tests. All negative. Af usually comes religiously but no sign yet? Haven’t felt the best for the last week. Very bad cramps in my hips and light stomach/back cramps and a little nauseous. Yesterday I was really shakey and that isn’t normal for me. Is there a chance my tests were negative because too early to detect?!

ya