TTC guilt

My fiance and I have a gorgeous 8 month old daughter together and have been ttc for about a month now, but sometimes I feel guilty for ttc while our baby is so young. Like thinking of her not being the baby anymore makes me sad, but at the same time we do still want another so it's just rough. I know that we have time if we want it but I also do not want to have anymore children after I turn 30 for personal preferences/reasons and I'm currently 28 so I feel like the time crunch is also feeling heavy on me. Anyone else been/going through this? Did it get better?