Helllppp

i have called the doctors and my thyroid blood test and something else that I can't for the life of me remember the name of has come back satisfactory I have had 6 blood test done for this and only my folate was wrong because it was low I am trying to conceive for a while but they have now said that as it is satisfactory there no action required but I still feel something is wrong as my period are irregular to 29 to 45 the last 3 months it as been 29days . 30 days . now this month 33 days and sometimes I can miss a month and not have it at all I'm so confused and stressed and scared