Help please!

On Saturday I was spotting brown.. Sunday nothing Monday had what seemed to be a reg period. Then Tuesday I spotted pink... (I also had sore boobs, some cramping that made for an upset stomach ) today is Thursday and last night and this morning I'm feeling an upset stomach and nausea. Is it worth taking a pregnancy test ?( also we've been trying for a year) I just don't want to take one if it unnecessary because of the let down. Thank you ladies.