Probation period

I suspect that my company is going to let me go. I have been with them less than the six month probation period. I understand that notice is seven days from either employer or employee wishing to terminate during probation.

I would like to know if there are any legal implications or obligations if they let me go during this time? What if I leave them?

And what about professionally, in terms of how it looks on my CV or to explain - better to be let go or better to resign (still in probation period)?

Any other questions I should be asking or addressing?

Thank you very much for any constructive advice or information.