What’s happening with my periods? Please read & help :(

Okay, so, I’m starting to worry, my periods have ALWAYS been regular 28 -30 day cycles. ALWAYS.

I had my period on May 28/29th. I bled for 5/6 days. (Totally normal) I then got expected my next period to be between June 27th/28th - no period showed up. Wasn’t pregnant .. worked out my next period should start on 25th/26th July ( if June period had been normal) & bang on time,after like 59 day cycle, period rocked up on 26th and lasted for 5 days as normal. So now my period for August was due like 22nd/23rd &&& NO SIGN of period at all.. I know I’m not pregnant as we’ve not been intimate this month due to husband working away most of it..

please can you give me ANY ideas as to what is happening :( I feel so down, like out of sync with myself, I’ve never had to worry.. and just as we’re thinking of trying to conceive.. my periods start going AWOL ! Please please help :(