Late period. Is it still possible?

Why would I be so late?? I’ve missed two periods now. 40 days since my last period. Cycle day 71. I keep thinking it’s going to start cause I was cramping and my boobs have been hurting for like a week, but still nothing. I took 2 pregnancy test around 12 days late and 20 days late but both were negative. Should I test again or go to the doctor?