In the UK we have 6 months maternity leave... and to be honest, I was pleased to return to work. I only worked part-time, but those few hours out of the house everyday was a relief. At the same time however, I did feel guilty occasionally about leaving my baby son, it was hard at times. But as I'm fortunate enough to be able to leave him with a trusted family member, then and now, I always knew that he was being cared for.
It is difficult and it does take time to adjust. Good luck