TTC newbie

Hi guys! So basically we have only been TTC since mid September so not long at all. My daughter was accidental and she's 8 now so when it comes to actually planning a child I'm pretty unsure of what to expect. So my period is now five days late had the cramps like it was on its way but nothing has happened. Today cramps have stopped, no af but loads of cm instead also tested negative yesterday on pregnancy test. Has anyone else experienced this sort of thing my cycle is usually between 28 to 30s so this is very unusual for me