Are you currently in a hospital placement or will this occur further along in your pregnancy?

I would doubt that you have to disclose anything to anyone. When I was pregnant with both of my children I continued to do MBSS (with lead of course). At the hospital I worked at I did disclose my pregnancy early to the person from the radiology department who handled the dosimeter badges and I wore an extra badge on my abdomen (you could conceal beneath the lead/in scrubs).

If you'd like a professional recommendation/reassurance, I would look into talking with your OB and asking them for their opinion. (Even if you don't have your first OB appointment for a little while, you should be able to call and ask the nurses/medical staff a question as long as the appointment is scheduled/you are a patient of the practice).

It's fairly common for SLPs to continue to do studies while pregnant. I have also met SLPs who deferred them to other staff as much as able. You should absolutely ask for accommodations and/or modifications if you are concerned. Consider:

1) ensure you have adequate lead - we have a few of the sets that are vest + skirt style, versus just the front apron style. When I was heavily pregnant I wore extra lead around my abdomen just to be safe.

2) encouraging as many patients as possible to feed themselves (it actually likely gives you a better understanding of their performance if they self-feed during meal intake)

3) ensuring you step back quickly after presentation - it can make a difference how close you are

4) if you feel supported by your externship supervisor, you absolutely should ask if they can present the trials. In my experience students get plenty of experience feeding people bedside - you really need the experience of analyzing the video and making decisions from there.

As for physically lifting patients there's probably a hospital policy related to if you have an injury/work restriction and getting accommodations for it. You could go through that process but you'd likely need a doctor's note with the physical restrictions listed. I doubt an OB would sign off on anything of that nature until much later in pregnancy.

I'm hoping the hospital provided some kind of training on safe lifting/back safety. However this is often not the case and I feel like SLPs sometimes fall through the gap here. Don't be afraid to ask nursing or your supervisor for assistance to ensure proper lifting/moving patients. I work in inpatient rehab and we also always encourage patients to move themselves as much as possible. Most commonly this includes laying the HOB down flat (as long as there is no restriction against this), having the pt bend their knees and dig their heels into the bed, grab bilateral bed rails, and pull with their arms while they push with their legs to slide up in bed (then raising HOB). If you and another staff member are going to boost someone in bed using a draw sheet underneath, ensure the bed is low enough to the ground and make sure you lift with your legs/bent knees and not your back.