Urgent Advice needed

I'm on the verge of losing it!!!

TTC for a while and for the last two month AF has decided to become irregular.

Month 1: 17 days late

Month 2: so far 11 days late

Before that AF arrived on the exact predicted date, I was always even prepared tampon or pad in my work bag, it was so predictable that not once have I even messed!

I'm so frustrated I just dont know what to do.

Is there pills i can take to regulate AF again, is there anything anyone knows of to help me..

Slowly losing it. Just trying to keep it together