At 5 weeks postop, it would be very unusual for a saline implant rupture. Even at a later date, saline implants are durable and can withstand normal person to person interactions, including hugging, bear hugs, contact sports, etc.
I think that if you have any concerns, a physical exam would be prudent, and you should meet with your surgeon. Best of luck.
Implants are generally pretty resilient, however with any kind of trauma to the chest, there is always a risk of rupture. The thing with saline implants is that if you did have a rupture, you would know pretty immediately because the size would decrease. If you have not had any type of change noticeable by look or feel then I am sure everything is fine.
Thank you for your question and I am sorry that this has caused you to worry. By 5 weeks much of your healing has taken place to ensure proper positioning of your implant and as you have not seen any physical appearance changes to your breasts all is likely well. It would be very difficult for your implants to be squeezed sufficiently that they sustained an injury or damage. Hope this helps.