When should I test?

Hello everyone! I'm new to Glow and fairly new to trying to conceive, and I need some advice. I took a pregnancy test earlier in the month because I was feeling off, and it came back negative. Shortly afterward, I started spotting (light pinkish-brown) for a couple of days. According to my charts, I was supposed to start my period around Mother's Day, but I have to keep pushing it back because I'm late. My periods are irregular, so I'm not too surprised about it being tardy; though, I feel somewhat certain it should've started by now. I'm wondering if the spotting was implantation blood. I would love to be pregnant, but I don't want to get my hopes up. Should I test, or should I not? 😔😫