What is the best pregnancy test to use?!?

Hey ladies! So ovulation day for me was 1/16 and that was the only time I had sex when I was fertile. I always get regular periods, 28 day cycle, ect. AF was due 1/29 and still nothing. Symptoms have been heavy/tender/sore boobs, mild cramping (like I have my period) and I'll get the worst heartburn out of nowhere. I tested twice once on the 29th and then the 31st only cause it was the one that said it can detect it 6 days before missed period. Both were BFN. I have a feeling I am though! I'm just gonna wait to test again until Friday. But want to know what test to buy this time. Anyone else in the same boat?