early early labor or am i delulu?!

Hi! due may 20th according to first day of last period and may 16th according to date of conception (we were trying so very documented), so here are my symptoms that suddenly hit out of literally actually no where. and when i mean drastic change, i mean like this past thursday i felt perfectly fine with the exception of occasional sporadic braxton hicks and friday woke up whole new lady. the symptoms are as followed. if TMI sorry in advance lol… heat flashes can not seem to be cool enough/feel feverish a ton excess phlegm/saliva drastically heightened sciatic pain(have been going to chiro since beginning of pregnancy for prevention and worked up until this point) braxton hicks that now are seemingly more sharp and intense in combination with new lower back pain feeling of restlessness and i mean no position sitting/standing/laying is comfortable lots of aches that will not subside all over literally head to toe loss of appetite intense acid reflux head aches periodically NO vision issues tho loose and increased bm like basically diarrhea immense pressure down there/feeling sore first trimester nausea is back so side note YES i know a lot of these can be due to how he’s sitting in there and if he’s dropped or can be like considered normal and common 3rd trimester symptoms BUT how drastically they all came at once quite literally over night…? mind you im not sick or anything either besides a bit of the sniffles but that may just because everything here is thawing in MN so maybe allergies also side note i have a OB apt this afternoon so i’ll get more clarity there hopefully but just figured id throw this out there anyways to see