im currently on cd 36 but my cycles normally last 31 days and have done for the past two years of recording cycles.. i had a very questionable positive test on cd 30 but i think i urinated slightly on the test. all of the rest have been negative

ive been tracking using opk amd usually i ovulate cd12 however i got to cd 16 with no positive opk so i stopped testing. i retested (opk) this morning and the test line doesnt show at all now

i have had slightly aching boobs and had pains on cd31 like period pains but no period came. iv had slight nausea 2 or so times and a slightly sore lower back but fine other than that. i have been urinating more frequently and i seem to have not much discharge? i also have had a slight burning from inside my vagina. i called my local maternity hospital and spoke to a midwife and she advised me that i coukd still get a positive test yet as i might just not have enough hcg yet to show up.

has anyone experienced this before? im losing sleep from the unknown and cant help but think about it. i realise i may have ovulated late but its not like me at all, especially as ive not been stressed etc. im worried i may also be experiencing a chemical pregnancy 🥺 just not sure what to do or think