I personally wouldn't do it. You're about to have a lot of emotions regarding your split and a pregnancy will only add to your stress. There's a lot to consider. How will you handle your first child while carrying another? Who will look after the kids if you need to work? I know there's a lot of single moms out there and it's hard. I was a single mom for a short time and it was the worst honestly and it messed with my mental well being a lot.
If it's what you want go for it! I'm a solo Mum by choice. Used a donor and I do not regret it one bit
Yes do it if you feel ok to support another baby. You'll never regret another baby but might regret not having another