Advise please someone

Currently 5 weeks pregnant I’ve been with this man for the last couple of years I found out he has another girlfriend she is pregnant right now with a big belly I just don’t know what to do… I part of me wants a baby so bad this will be my 4th and it’s something him and I have discussed before he wants me to keep it but apart of me wants to get rid of it thinking of all the bullshit that’s about to unfold… I just don’t know what to do man… I feel like I’m going to be miserable but apart of me was so so excited to have a baby with him. Can I get some advice or somebody to talk to please I’m mentally going crazy and have nobody to talked to about this..