Curious as to what the FlyerTalk consensus is about using the scanners vs. opting out when pregnant. Do all of you opt out?

I usually travel with a toddler, so I've avoided the scanners for several years now (we get sent through the regular metal detectors), but I was asked to go through a scanner about two months ago when my husband escorted our daughter through the metal detectors first. I opted out, as I was barely out of the first trimester of pregnancy.

I have a several more flights coming up before I am officially grounded (some without the toddler), so I'm expecting a lot more chances to be sent through the nude-o-scope. Planning to opt out if forced, but would be interested to know if I might get some consideration with a now-obvious bump. Home airports are SFO and OAK. Anyone have guidance as to treatment of pregnant women in these airports?