Had a interesting feel today while doing chest

Started with Incline Smith BB press in pyramids
Then moved to Decline BB presses on smith machine
After my 3rd set of declined I felt extremely pumped, but I didnt stop, I did a 4th set then moved to Pec Deck doing FST-7. Still felt a pump but not as huge as before

Question being, stop training at that extreme point? Or keep pushing? My concern is it is just a pump that will last for 30 min then I felt like I didnt train; im looking for advice if anyone was tested both ways and how it affected them etc, thanks!