Pregnant With A 3 Month Old Baby

This wasn't planned at all I didn't expect this pregnancy it's too soon I feel it's going to be very hard and my first born is going to have a hard time with a newborn brother or sister I'm stressing over this I wasn't planning on getting pregnant too soon I wanted another baby in like 5 or 3 years it's a blessing I know but I fear it's going to be way too hard with a one year old baby and a newborn ....