Got my BFP after A YEAR of TTC with Endometriosis

Taylor • BABY #2 DUE: October 2019
Hi there!! My name is Taylor I am 24 years old. My husband and I have been TTC for about a year now. We were married at 21 and soon after I was diagnosed with Endometriosis. The last few days I have been feel nauseas, so tired, light cramps, sore breasts. I was due to start my period today so I decided- why not take a test? I did- and it was POSITIVE! Like very dark line. I have had NEGATIVE tests for so long that my first thought was, "it's a false positive". So I went to the store and bought a different test, that one as well was POSITIVE- a VERY dark positive line! The app is telling me I am 4 weeks today! Due at the end of March- a few days after my 25th Birthday :)
So my question for all of you is: How often can do women get TWO false negative tests? I have a doctors appointment in TWO WEEKS but I don't want to wait that long to have a HCG test done. What should I do? Would you recommend going to a walk in clinic and requesting and blood test? Or should I REALLY consider the tests POSTIVE and that IAM INDEED PREGNANT!! I'm just so scared to get my hopes up until the doctor officially says "you are knocked up".