Help Please!

Hello, my name is Lydia. I am 20 years old, and my fiancé and I have been TTC for 4 cycles now. My cycles are regular and they're normally 30-32 days. Today is Feb. 24th and I am currently on cycle day 40. I have been VERY nauseous for about 4 days now, I'm weepy, & VERY gassy. My period is currently 8-10 days late. I too this test today Feb. 24th at about 12:30pm, and it's a negative. I've only been pregnant once, and it took me being a whole MONTH late before I finally got my bfp because my HCG levels were low, and sadly I miscarried about 3 days later. Considering my period is 8-10 days late, could I still possibly be pregnant? Maybe my HCG levels are just low like last time? I have an appointment with my new OBGYN on March 2nd. Should I have him/her do a blood test if my period hasn't started by then? What do y'all recommend I do?