Work issues

Megan
I've been told tomorrow at work I'm going to be trained for a lead role in my work, haven't got promoted but it will be coming, that's what happen to the last person how was trained in this role.
​Feeling a little conflicted about it as obviously haven't told work about ttc no 2 and the new role I'm getting train for comes with a great maternity pack but more hours and responsiblies and stress.
​Also don't know that once I did have baby number 2 I was going to give up work. Feeling abit dishonest about not saying anything but can't really say anything about it to my boss.
​I've only been ttc since May and it could take many more months to get my bfp. What if it does happen sooner  than my boss maybe alittle miffed they she trained someone who will be takening mat leave and possible no coming back :/