Jo Wilson (Camilla Luddington) may not be quite ready to add another baby to her brood.

In PEOPLE's exclusive preview of the April 11 episode of Grey's Anatomy, Jo frets over the possibility that she is expecting a baby with boyfriend Atticus "Link" Lincoln (Chris Carmack) as they already have their plates full with her daughter Luna and his and Amelia Shepherds (Caterina Scorsone) son, Scout.

This is the worst time to consider having a baby. It never stops, she tells Link as she searches for a pregnancy test at the hospital. My written exams are coming up and Lunas starting preschool.

ABC

If their busy schedules werent enough, she soon panics that another baby equals more dirty diapers. Oh my god, the diapers," she notes. "Do you know how many diapers we would need if we had three kids who weren't potty trained?

Try not to panic. This could be nothing, Link reassures her, but she adds, Six diapers a day per kid, that's like, a thousand diapers a week.

Link realizes her math isnt adding up and tells her, Not even close.

How could this happen? Jo asks. I'm an OB-GYN, half my job is to have women not get pregnant.

ABC

Once she finds the pregnancy test, Link tells her that she is spiraling out of control and she counters, How are you not?!"

The pregnancy scare comes after Link supported her when she felt guilty about her happiness following Sam Suttons (Sam Page) death. He reminded her that she had experienced a lifetime of hard and was deserving of their long-awaited life together.

Every time I saw you go through something awful, it broke my heart because you are the fiercest, kindest, smartest, most loyal person, he said. Those years when we werent in each others lives, those were dark years and I thought of you every single day. So weve been through too much together and apart. You deserve this. We deserve this.

Liliane Lathan/ABC/Getty

When she asked what happened if they didn't work out, he responded, Oh, were going to work out. I just wasted 20 years of my life not acting on it."

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Grey's Anatomy airs Thursdays at 9 p.m. ET on ABC.

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Grey's Anatomy: Jo Is 'Spiraling' from Pregnancy News (Exclusive) - PEOPLE