OP comes on asking for advice as to how to deal with her feelings and stating she is struggling to deal with them. She did not state her view was right, nor her friend was unreasonable, quite the contrary.
She gets a barrage of responses telling her how awful she is.
well done MN, , that's really, really unhelpful and possibly more damaging for the OP. This is not AIBU, she asked for advice on the relationships board, not judgement - a bit more understanding and kindness would not go amiss (ironic given the 'judgement' being doled out).
OP, those feelings are totally natural, I commend you for trying to process them in a way which is not damaging to you, your friend or your relationship (i.e.: by anonymously reaching out for advice.) You know you should share those feelings with your friend and should control the urge to leet the feelings influence your relationship with her.
Allow yourself space to feel frustrated and sad at the process you are going through (took me 18 months to conceive DD1, all 3 SILs fell pregnant at first time of trying so I have been there). I found it helped to prepare mentally for time with the pregnant ones so I had ready-made responses to comments and sensible questions/compliments. By reversing it in my mind I was able to strip out my personal anger and frustration and allow the rational, kind responses to come through.
As people have already advised you should not project 'blame' for your predicament on your friend who is blameless. Judging and comparing lifestyles will achieve nothing so just stop doing it. If you need time out from Facebook/whatsapp so you are not constantly confronted by it then to that too - not with a display of flouncing and 'pity me' just ramp down use or say you're taking a break from it to see if that has a positive effect on your life.
I found that really focusing on all the positives in my life helped most. My DH, home, job, holidays/nights out to look forwards to etc. It stopped the lack of pregnancy becoming all consuming.
Good luck and I'm sorry people have given you such a rough time for feelings which are so natural and so common. 