Implantation

So, I came off cerazette a few weeks ago so I don’t really know what my cycle is like ! However, my partner and I have been having sex since. The last few days, I have noticed mood swings, really bad cramping, thicker discharge and for the last 24 hours have had the worst nausea & cannot stomach the thought of food !

Could I be pregnant? Or is this a side effect of coming off the pill?

I did have my withdrawal bleed on the 1st of this month.

Any advise would be greatly appreciated :)