So I'm 17 days late for my period. Not pregnant. What's the next move??

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So I am 17 days late for my period. I took 4 different brands of pregnancy tests all are negative. Went to the doctor their pregnancy test were negative too. My body weight had been the same for over 2 years but I conceived twice back in 2017 and 2016. I do not have pcos and my blood pressure is 120/80. I'm not entirely stressed out either. Is there any advice that anyone can give to me about what to do? I feel so awkard not knowing what's going on with my own body.