Hi there and welcome. Sorry for your fertility battle. Most couples do go on to have a baby, know that! Mild cramping can be a part of early pregnancy or your period coming. It is hard to say which. Try not to worry and go on about your day. That you ovulated is a good sign. Cycles/patterns CAN switch. If you hadn't been ovulating, you could not begin ovulating. Do you track your cycle? How long is it usually? Are you working with a fertility doctor? Taking clomid?
Thank u so much for responding. Yes I do keep track of my cycles they vary from 40 odd to 31days I'm currently at 33 days and have been the last 3 periods. No we not having any fertility help as my husband already has children so we don't meet nhs criteria