Desperate. Please help

My cycle is typically normal. Starts anywhere between the 10th and 14th every month. I haven’t had my period since mid January. I have taken a test and got what I thought may have been the faintest of lines (blue dye test) it popped up instantly after and was taken with my first morning pee. I’ve since taken 3(spaced apart different days with first morning urine) first response pink dye test and they’ve been clear negatives. Still no period. I’m freaking out and can’t get into my doctor until 2 weeks from now. Is there still a chance I could be pregnant? What other possibilities could there be? I’m not scared of actually being with child. I’m more afraid of 1 if I am why am I still getting negatives after being so late and 2 could it possibly be another serious health risk. Have any of you ladies experienced this? Thanks in advance.