Need some reassurance

Hi all! I am on cycle day 42.. Average cycles have been 37 days since off BC. Once it was up to 45 days and it has been as low as 32. I've been off BC since January but we just recently decided to start trying. I am having some cramping and clear CM. And I'm just feeling nervous that I may be pregnant. When should I test? I don't want to do it too soon.. But I'm also anxious to find out! Could I be pregnant or is this going to be like every other month where I test and get a negative?