so i missed my period yesterday but my doc says beta was neg like 4 days ago

UPDATE: so im late now by three days and i just took a pregnancy test but it came back negative. I feel so sick to my stomach, my boobs hurt, and they seem a lil bigger too, plus i have to go to the bathroom like all the time, i have heartburn and my lower back hurts. What should i do? How long should i wait to retest? Is it even worth it to retest? Ive been takkng the $ tree ones idk how effective they are? But should i get like a clear blue, or first reaponse?  I feel like im pregnant, and have a sense that i might be something just feels differnt about me. Idk maybe im kidding myself cuz i really want this.

Thoughts?