I went back to work when dd was 14 weeks old. I'd started my job after finding out I was expecting and felt like I owed them something. I went back for 2.5 days a week. Childminder had her for 1.5 days. Grandma had her for a day.
She loved it. Thrived on it. Always says it was fun when we talk about it and wouldn't have it any other way.
When she was 5 I gave up work (sounds backwards, doesn't it?) but I'd just had my 4th/5th miscarriage and realised this was my lot in life. One child only. So I decided I'd stay home and look after her.
Do I regret giving her to someone else at 14 weeks? No... definitely not. Though there were days when I wished I didn't have to leave her.
In the end, I made sure the time we did spend together was focussed totally on her. We had mummy & squillychild days all the time I was at work. She chose where we went and I made sure they were memorable (so much so that she remembers a few of our trips now and she's 7!).
Go...you are not evil. You're just a mum trying to make things better for her family. Your children will benefit from great socialisation skills and, if the nursery is good, a great start to their education.
More than that, they'll have fun.
You should too! Chill sillysillysally. It's all good!