Leave over?

I was getting ready to go back to work tomorrow & I noticed this email. I got approved leave up to the 22nd of March only because anything after that I had ran out of time. But now I get this email saying I can stay longer to bond with my child? I’m confused since I had only gotten approved 12 weeks for job guaranteed. If I stay longer is there a chance I could loose my position? I really want to stay longer with my baby. But I get paid good money in my current position I don’t want to loose that specially during these hard times 😐