When to take a pregnancy test?

So my boyfriend and I aren't really TTC, mostly because we plan to get married in a year. He told me he came in me and I was freaking bouncing off the walls happy. We took a pregnancy test and it came back negative, and we were both broken, because we wouldn't mind having a baby, we'd actually love it. I read that if you test too early the test won't pick up the levels of HCG. I'm supposed to start my period this Sunday but haven't had any symptoms of PMS. What to do?