No period... BFN

My last period cycle was in May. I didn’t have a period at all in June & still haven’t gotten it this month. All the test I’ve taken have come back negative & I’ve had no symptoms of my period coming (sore nipples, cramping).

Is it safe to say I’m not pregnant if I’m this late with 5 consecutive negative tests?? Can high stress make me skip?

Has anyone experienced this?