I had too had problems when I droped of DD..

The first day I sat and played there for a about and hour.. I sneaked out while DD was playing.. I would watch from the window to make sure she was settled.. (still do) I only left her 5 hours (2 of those were nap time) DD would always be screaming and crying when she saw me in the afternoon..

My mum helps too so she drops DD off too.. From what the daycare tells me, my mum would lead her in with a jelly bean and let one of the staff take her.. Yes she did scream.. Yes it was hard..

I made a point of telling her that I will be back to pick her up after her afternoon tea.. It took between 6 to 8 weeks for her to be ok.. (Plus she got a new career in her room so that helped too I feel)

The only thing I would suggest is on your day off, go with DS to daycare and spend a couple of hours there.. My darecare suggested I take her for a couple of hours a day before..

Its tuff being a working mum..