Hormone advice

I would value any advice . Has anyone experienced this? I have skipped my period by just over 10 days, but began to get a blistery mouth on and off, and quite tired, i have a sleep condition but felt tired than normal, and a bit achey. I have done three pregnancy tests which are negative 😔 I'm worried my hormone levels may be an issue and am trying to convince myself its highly likely im not pregnant, and that i may have to take one step back to take one forward in order to try again. Thank you