What do I do??

So I'm 8 or 9 days late on my period and I always get irregular periods. My husband and I have been using the withdrawal method for some time now. I have taken 4 pregnancy tests in 4 days and still getting negative results. Am I testing too soon and if so is there any chance that I could be pregnant? The longest cycle that I've had was 29 this cycle is 35 days in counting. I would really appreciate some advice and help on this subject. I have never been more than 4 days late. Thanks in advance.