Need clearity

This month my period stopped a day early which was no red flag to me considering i drink alot more water now and have layed off a lot of the bad foods. But when Glow told me i was ovulating of course me and my bf had sex. After all I do want another child. Two days after sex I spotted very lightly for 2 days. Should I invest in a pregnancy test or wait to see if auntie flow shows up? I am supposed to start my cycle again in one week.