Can I not maintain a pregnancy?

Heather • 2 angel 👼🏽👼🏽 🌈 Mother to daughter born May 30 ❤️❤️

Second mc/chemical at 4 weeks, I started bleeding again at the exact same time. Is it possible to get pregnant easily but not be able to keep the pregnancy? I’m only 24 I don’t take any medication and I’m healthy other than being a bit overweight. I want children so bad but I don’t wanna be selfish and keep conceiving if I’m gonna lose my babies. Any advice or similar experiences please 😔