It is more my issue than anyones you're all right, I suppose I'm just really insecure from my last relationship he cheated while I was pregnant
Really sorry that happened to you, OP💐
Being cheated on is really up there with one of the most soul destroying things. And whilst pregnant, I can’t imagine.
But, you cannot let the actions of a previous ex affect your current relationships. You’re obviously insecure and have trust issues. This is something you need to accept and work on.
By being suspicious of your new partner, checking his social media and asking him “who is she?” etc, is going to put a strain on things and push him away.
The first 4 months of a relationship is where it is the exciting honeymoon phase. If you’re having trust issues and suspicions this early on, it’s only going to get worse I’m afraid.
You also need to learn and understand that looks aren’t everything. Comparing your looks to this girl isn’t going to make you feel any better about yourself, or make you feel any more secure.
IMO, you really need to think if you feel secure enough to continue in this relationship.