IVF worries

So, my husband and I have 2 daughters - one conceived between rounds of fertility treatments and one conceived via IVF. Since getting pregnant with my littlest I’ve thought about “what if they used someone else’s embryo” (I didn’t really think they did, it is just one of those things that was in the back of my mind since this baby was conceived without me being even in the building). Then right after I had my daughter came the news of the poor family where they did use the wrong embryo. After looking at this pictures of my two daughters, from around the same age, I think it’s safe to say they’re sisters. 😂🤣