I recognize that it might be triggering some automated filter (this is my home deployment, not connected to any corp/company policies so only the default Meraki rules are in place), but I'm concerned that especially here in the USA a URL that would grant access to info related to women's health care would get blocked.
that site is not even categorized so content filtering won't block it. Just make sure you are not blocking the URL somewhere or blocking the site IPs (126.96.36.199 and .158 / 188.8.131.52 and 145). Just to make sure you didn't miss anything, just whitelist your computer, wait about 5 minutes and try again.
If the site is site blocked, try with a different DNS like 184.108.40.206, 220.127.116.11, and 18.104.22.168. If still doing the same thing, this could be something upstream blocking the site especially if your home router is in NAT mode.
Also, this could be something to do with your home public IP that was blocked on the server-side. If the MX is using a static IP, bypass the MX and connect your computer directly to the ISP router using the same static IP used by the MX and give it a test.