Spotting?

My fiancé is TTC and is really hoping I am pregnant. I had super bad cramps on Monday and started my “period” but it has been light and today there was very little. I read somewhere that spotting only lasts 2-3 days. I’d like to keep from buying pregnancy tests if I’ve started my period but I’m just not sure what spotting is suppose to look like. (Yes I’ve tried looking up images, but seems like it is mostly different for everyone).

Any advice?