I'm so confused 🤔

Trying to convince baby number 2' 23 month of trying AF has been on time every month anyway in May it was late by 10 days I did a test negative but AF came & went I assumed my periods would go back to normal (31st/1st) of every month & again no show' so I thought maybe my period date will change with been late so period due 9th/10th and again a no show 🤔 now I'm Starting to worry what the hell is happening it's the 16th so I'm either 16 days late or 6 days late but why then hell am I late again 😩 anyone any advice I can't deal with this I just want to get back to trying again 😔