Should I test... Any advice?

I was due on my cycle on 5/16 and still nothing. I've had some back pain and stomach cramps since Saturday but no period. I had sex just after my ovulation date in glow, but didnt actually check to see when it was peak time. I did have some clear discharge around that time, which has increased over the last few months... like a lot. I dont want to get my hopes up if its just a late period, which as happened before due to stress and death of family a year ago, it was a week late. I'm not experiencing anything like that now, and at times my cycle will be a few days late or early here and there, but a week is late is very irregular for me. Do I test or just wait?