Confused

So I was supposed to start my period on the 28th and nothing has happened. Well on the 29th still nothing til that evening I started spotting which is weird to me cuz I usually never spot. It’s been very light and the pad be still clean just when I wipe. I’ve never been pregnant before so I don’t know what to look for but google lol. I want to test but I’m afraid right when I buy one I start AF. Any advice?