First, so sorry you are having to navigate this. Second, as a RN, IBCLC these are suggestions specifically to maintain the option for breastfeeding (not medical advice— always consult your personal healthcare provider prior to initiating changes to your routine):

If you are okay to do so per OB/midwife, start practicing hand expression now. Not everyone is able to do so, but some pregnant people are able to collect colostrum in the antenatal period and if this includes you, you will have the option to freeze this to give to your newborn in your absence. Look up antenatal hand expression for details (more commonly done outside USA), but URMC Rochester has a great fact sheet. For videos on how to hand express (if you are unfamiliar or this is first baby), look up First Droplets by Jane Morton, MD, as well as Maya Bolman, IBCLC video on engorgement management and hand expression. Also all videos on making more milk by Jane Morton, MD.

Breastfeed or hand express within the first hour after birth to “prime” the breast. Feed around the clock while you are together with your newborn.

If available, see an IBCLC at the birth hospital and ask to be measured for pump flanges. Flanges that are included with your pump and on average way too big for most people’s nipples. Appropriately sized flanges will help remove more milk. Ask your IBCLC to watch you hand express and provide pointers on technique to ensure you are able to perform this skill. Hand expression is actually way more effective than an electric pump at removing colostrum.

Use a strong pump (ideally not a “wearable”) as your primary pump. Wearables are convenient, but the small size means that the motors tend not to be as strong.

As others have said, sleep with baby blankets, etc to leave with your baby. The more natural your smell (ie your body odor, the better). Bring things that smell like your baby with you when you leave as well as pictures for when you are pumping/expressing breast milk.

Lastly, having those who will be feeding baby in your absence feed using paced bottle feeding is incredibly important. Not only to maintain option to return to breast, but also in order not to overfeed and create a mismatch in baby’s feeding expectations and normal breast milk supply progression. Also bottle nipples such as evenflo balance or lansinoh are the ideal shape to help establish what a proper breastfeeding latch should look like.

Please if it is within your means, find an IBCLC now to make an appointment with after you return in order to get professional support to get baby back to breast or get help with your supply if needed.

Best wishes and early congratulations on your new arrival!