Should I be concerned?

I had my last period about 2 weeks ago. Glow says im ovulating today. But I just got some spotting today... my breasts have been sore for the last 3 days, but nothing horrible like a period. I highly doubt I'm pregnant, as my fiancée works out of state for 2 weeks at a time and is only home for 5 days (he leaves tomorrow). I'm not sure if I should be concerned or not... We aren't really ttc YET.