I am pro choice and opposed to this decision in the United States, but do you have any sources regarding adoption and fostering agencies being overwhelmed as a result of a lot of extra babies being born?
I just did a search in the news, and the only stuff I could see was news articles from summer 2022, saying that such organizations might see an increase as a result of the new restrictions on abortion.
I would actually be surprised if the abortion restrictions resulted in this (or at most, there might be very short-term blip that would be corrected quite quickly); experience from other countries suggests that when you restrict abortion, women just double down on birth control and the MAP. In particular, people who think they do not want any (more) children but are not 100% sure, become more likely to seek permanent sterilization at relatively earlier ages, in order to avoid the risk of an "oops" pregnancy, (as opposed to situations where abortion is easily available, in which those same people are more likely to go on the pill etc. or encourage their partners to do this, and leave their options open for longer).