Baby #3?

I have a 3 year old and my boyfriend has a 4 year old we dont have kids together but we both want more kids..... he gets deployed in September. I went thought my first pregnancy alone and I dont wanna do a second one alone. He tells me to stop worrying and he will be there regardless and I believe him. I just wanna experience it together. Half of me is saying go for it and the other half is saying wait. With his schedule and deployments I dont think there is ever a "perfect" time.