How common is it to completely skip a period? I have been like CLOCKWORK my entire life. I know they’re common for women who already are irregular but I am not irregular. The most I’ve ever been late/early is a couple days. I am 18 days late! HPT and blood hCG tests both NEGATIVE. Not under any stress, no weight gain, no sudden hormonal change, NOTHING. I’ve been reading about a lot of women who didn’t test positive for pregnancy until they were very late into it, some like 4 months!! Has this happened to anyone?? Anyone else have any ideas??