Trying to conceive

So I've been using this App faithfully for almost a year and still nothing... This time, the day my period was supposed to start, which was two days ago....I spotted, as well as the following day, I spotted. Today I spotted, with a slight bit more than the past few days. Only time I notice is when I wipe. What could it mean? Its not enough for a pad, tampon, or liner. Could I be expecting? Or is it just a really light flow? I usually have really heavy flows