Second pregnancy anxiety

Hey girls, Really looking for some advice and support. I’m pregnant at about 6w with my second. It was planned as I have some health issues and been advised that now would be the best time as the longer I wait it could affect my fertility. My baby is 10mo, she’s the best thing to happen to me. I love her so much. I love being her mum. But my partner doesn’t help with her, at home. He’s away all the time, I worry about how I will manage with 2 under 2. I worry that I’ll just be an exhausted mess, and regret it. I worry that I could become poorly, and not be the mother that my first baby deserves in order to have a second. I feel guilty already. I’m sad because I do want this baby but I worry so bad that something’s going to go wrong. I recently had a MC so I’m wondering if this anxiety is coming from this? Just need some support because I feel so alone with it at the second x