2nd baby in 2 years!

I have just found out I'm pregnant again! But my first is only 5 months old (almost), it was a huge shock but my partner & I have decided to keep the baby. I'm currently on maternity leave from my job, I am seriously worried about telling them I am pregnant again! I found out I was pregnant the first time literally a month after starting the job! They were really supportive don't get me wrong but the owners of the company are quite money hungry so I'm worried this time will be different... I'm considering quitting as I also got offered a new job which I accepted a week before finding out I was pregnant with my second baby! Anyone else been in this situation?