feeling scared about everything!

I have been with my husband for 10+ years. we've been married for almost 3. We always had an apartment for the past 8 years and always managed to somehow get by. In August we bought my sister out of my childhood home and moved in. It wasn't exactly my dream but I made the move because of him and his daughter. I wanted to provide a better life for us. In July we started ttc and in September I found out I was pregnant!!! We are overjoyed. My stepdaughter is so excited to be a big sister. I am 8 weeks now, and today while going thru bills, I started to cry. I don't know how we will manage the bills and responsibility of this home and bringing a baby into the picture. Did I jump the gun too fast? Did I make a poor decision? How will we make it and provide for this beautiful baby? I feel like I made a selfish decision, but I will be 35 and don't want to wait any longer to have this baby. Everyone always says it's never the right time and you'll figure it out....but are they right? Please tell me I'm over thinking this and it WILL be ok!!!!