I need serious advice please

Megan • Married💎Olivia 4/1/17• Baby #2 due in April•metformin.🌻
So. Just got my for sure positive last night. My period isn't due until Monday. I went to the dr and their tes isn't sensitive enough to pick up the HCG and they refuse to give me a blood test until one week after my missed period. I have symptoms for sure but I have cramping.. Like I'm about to start my period and it's scaring me.. Anyone go through this?!