Different feelings/opinions towards thing whilst pregnant-not pregnant?

So whilst I was pregnant my partner unblocked his ex and went through her fb. I was gutted but slowly managed to get over it, now I have not been pregnant for 3/4 days and it is starting to get to me? Like am I being petty? Do I even have a right to be so hurt and upset by it now? Was I just numb to things whilst pregnant? I don’t know but all I do know is that I’m now feeling hurt, not enough and that I cannot trust him… even do I still feel the same about him seen as he could do that to me? I just don’t know anything now