Well, as I've said before, there's nowhere to get birth control in most small towns. So, it takes gas money, time, and money/insurance for the doctor to get birth control (yeah yeah, every gas station has condoms, blah blah, but the failure rate on those makes them not something you want to solely rely on). The best thing about the ACA was that birth control had to be covered, taking away one obstacle, if that goes away you can bet there will be a pretty big bump in the birth rate.
There are also a few people I know who had decent jobs when they had their kids and now they can't find anything that pays half as well. You can't exactly dump a kid at the shelter if you get laid off and have to take a lower-paying job.
Again that has nothing to do with the bigger issue. Most of these safety nets were created for people in that situation many who will find themselves ineligible if they need a few months of help in a crisis because their previous income puts them over the limit even though they may have zero assets or income at that point. But if you start out with nothing and get into the system you have it all on your plate. And for women they just have to get knocked up. Men don't fare very well. If you can't afford BC you can't afford the activity that will put a child in your care. Either one of the parents. In real life that baby costs a lot more than gas and a doctor visit. Medicade expansion under the ACA has simply added to the problem.