Could i be pregnantt,?

My periods used to always come ecery 28 days but sjnce i had a chemical pregnancy back in september theyve been coming on day 24 or 26 but never gone past day 28 im on day 26 today and had last niggt which usually brings on my period, but its half way through the day and no spotting or blood and no cramping just extremely tired and sore i also got surgery two weeks ago to diagnose endo but they said there was none. But they did push the dye through my tubes. Dont wanna get excited or worked up if its really nothing. Whatcha think? Btw: had a lot this month even after surgery which i was ovulating