Question ladies...So my MIL bought me a Breast pump from a lady she said used it "once" and I used…

Question ladies...So my MIL bought me a Breast pump from a lady she said used it "once" and I used it and had no issues..after my son I let my friend use it since she has zero money but wanted to BF...now that I'm pregnant again I planned on reusing it BUTTT now I found out it's not sanitary to use used Breast pumps..I NEVER knew that or I would've bought a brand new one and never let my friend use it. SO do I just sanitize it again or buy it new ?? I'm making a list of pricier stuff I need to buy and I JUST thought of this ! Help 😩