Telling SIL and BIL we’re pregnant

Sorry for such a long post... I gave all the details....

My boyfriend’s brother and wife have been married for 3 years. They have been TTC for about 2 years. We’re really close with them (I would consider them some of the best friends I have)

Me and my bf are (obviously) not married and have been living at my parents house for about the past year or so. My boyfriend just finished school and is job hunting so we can move out and buy a house before I give birth (July).

My boyfriend will speak to his brother. I’m just not sure how to tell the SIL. They are moving into a new house this January and I was thinking about telling when we’re helping them move... or maybe after they’re settled in.. I’m not sure... I know she really wants to get pregnant and I don’t want her to be upset and stress about it more than I know she already is.

I’m hoping once she gets her mind off not getting pregnant it will happen to her. I don’t want her to focus on it and she definitely will once I tell her :(

She’s said things a few years ago like “you have to wait until I have kids!” But it was more joking but it still worries me.

I love them both dearly and I know it will be okay in the end but I have been avoiding it because I really don’t want her to be upset.

Earlier this year I was pregnant (unexpectedly because I was on depo) and I lost the baby. It was really hard and my boyfriend said we could try again right away if we wanted to.... I did wait a while though.. I actually conceived on the due date of that baby :’(

I’m currently almost 14 weeks and won’t be able to hide it much longer. I feel maybe they’re already suspicious because I haven’t been drinking.

We’re helping them move in a week or so.

Then on the 16th we’re going out of town for 9 days.

Anyone is a similar situation or been in the SIL’s position? What and when would you want to hear the news?

Should I tell her when moving, or after I get back from the trip?

Basically just needed to vent. Any advice on anything is appreciated. We haven’t told anyone else in his family because we want to tell them first..

I just don’t want to take the focus away from a new house back on wanting a baby. She doesn’t work and babysits for money so it’s on her mind always as it is... I have just heard if you stop stressing about it, it happens. 😔 okay rant over don’t be too hard on me please!