Am I making a mistake

So my partner(ex) and I have been trying to have a baby for a very long time. Here I am, practically out of my first trimester and it’s safe to say I’ve done it alone. After finding out he has been seeing his others child mother behind my back, he even continues to live with her and sleep next to her every night. He comes around d me with the lies and makes me think and feel things are going to be different but deep inside I know it’s a lie. Today I find out the gender and I’m going to be alone and it hit like bricks that I’m really going through this alone. I’ve been so depressed over the last few months and decided to look into support groups because I know mentally and emotionally I’m not okay. Am I selfish or making a mistake with going through with this pregnancy knowing there’s a strong possibility of the baby being fatherless