Weird pain and period

Leigh
Hi everyone!
I have been TTC for 6 months. Asking for advice for anyone might have been through something like this: my "period" started 2 days late and was very light. Now, about 1 week later, I have this intermittent short sharp pain in my left side, around where I can feel my ovulation usually. Part of me wants to take a pregnancy test and part of knows it's probably a waste. Any ideas?