pregnant or late from illness?

Angela • PCOS. Male factor infertility after cancer. Pregnant with first after 1st Fresh IVF round. Due 27th Oct 19. *3 lovely step children*

Hi I am ttc and I'm 2 days late for AF which is really unusual for me. i have a hard bloated tummy and been having mild cramps on and off with a lot of clear/white CM(usually I have constant cramps for 2 days over period which are more painful and no CM). I'm hoping I am pregnant but took a test yesterday which was negative. I had what I think was food poisoning after my ovulation time this month and wondered if this could be the cause for me being late (don't want to get my hopes up too much if this is the case) please help xxx