@MNWorldisCrazy Am also a pregnant lady with ongoing MH issues (inc CPTSD). Sorry to hear you've been through so much. Personally, I experienced a miscarriage during lockdown. Partner shielding, so no way of them coming with me. My local hospital during miscarriage and subsequent pregnancy has old, poorly adapted buildings, so no way of DP accompanying me regardless. Would have loved the support OP has received, but I DO NOT resent them in any way for receiving it.
If I've understood OP correctly, what's really upsetting them is thinking TOO MUCH about others. Like...have I done something wrong? Do these people think I'm horrible and entitled? All this compounded by the fact that as you'll know, trauma response can make you very sensitive to shouting and aggression. I think OP has handled everything admirably considering, and shouldn't need to dwell on the other lady's feelings any further, other than to feel sympathy.
I'm happy that you manage your PTSD to the extent that you are able to get through antenatal appointments (and I'm sorry to hear that you've been through so much), but that doesn't mean that OP should have to. It's not a zero-sum game.
And being able to explain your feelings is admirable, but is NOT a metric for how entitled to help you should be, as my charity-funded CBT therapist used to remind me all the time when I felt guilty for being there. Hang in there OP. You can do it, try not to listen to the negative voices.