YAY! Or NAY?!

Shakyla • I have a one year old baby girl💞🥰 & Pregnant with baby #2 🥰

According to Glow AF was due this month between the days of the 18th and the 22nd it is now the 21st and I still haven't gotten AF! Should I keep my hopes up and go buy a test or should I still wait since their is more days of the moth left? Btw Glow has always been correct on the days that AF suppose to show up!