Feeling guilty

Ne
My son is 6 years old and we are very close. I'm pregnant again and I'm feeling super guilty..like I don't want him to feel like he wasn't good enough or I'm going to love him any less..another reason I'm feeling guilty is this baby is with my current boyfriend who is not his dad..I'm afraid he's going to feel he's different or doesn't belong..anyone ever have these feelings? If so, any advice?