Period late

So I love this app it usually is right all thee time either a day before or day late... I was suppose to start my period on 1/26 I put that my period did not start so it moved it to 1/29 which is today I have not started my period or had cramps I had cramps yesterday and nothing so since I did not start yet I put no and again it moved it by two days saying start date will be 1/31. I am TTC but then not like I’m not pushing it if it happens it happens but I have never been days late on my menstrual more then 1 day. Has this happened to anyone else?