pregnancy advice


I'm 20 years old about to be 21 and I think I may be pregnant. I am 7 days past my period and it still hasn't come, I have taken multiple at home tests and they have all been negitive. I went to a doctor and she got me to do another pregnancy test which came back negitive, so I'm really confused, I have always been very intune with my body and notice the slightest of changes. I am now too scared to go back to her or any doctor because she grilled me over possibly being pregnant as well as saying Im too young. Some of tge symptoms I have are; Extreme hunger, nausea, headaches, heartburn ( have never had before ), cramps, dizziness ( never had before ), extremely tired all of the time, emotional and mood swings, sore throat and blocked nose. Those are just some of the things I have been experiencing that I can think of, but if anyone has any advice, or anything else I should look out for please let me know, I've never done this before and I'm really unsure and scared, thanks.