Super stressed at work?

Al
Anyone else feeling like maternity leave is a trick to convince women to put in twice as many hours in their 3rd trimester due to guilt/overwhelming work loads?
Honestly, my husband & I can definitely afford for me to go on maternity leave (12 weeks unpaid), but my employer can't afford to hire a contractor to do my job & I am struggling with the horrible position I'm leaving my team in. I am thinking about lying to my boss & telling her I can't take maternity leave b/c I feel so horrible about it. I just don't know what to do :(