There’s not really enough information to say for certain but If you will be working on the Monday in week 4 it will definitely not be legal.
You still need either two regular weekly rest periods or one regular weekly rest period and one reduced weekly rest period in two consecutive weeks, you haven’t got a regular weekly rest period in the three weeks so from what you’ve posted I’d have to say it’s not legal.
In stead of working overtime on Sunday of week two you could work Saturday of week two or Monday of week 3, I know you probably want to work Sunday for the premium pay but…
edit: This is of course assuming that the job you do falls within the remit of the drivers hours relaxation, it only covers certain types of job.