Pregnant - unplanned - terrified

Summer

Hi ladies! I have a 9 year old daughter and a 14 month old daughter and just found out tonight that I am pregnant. This is completely unexpected as I have been taking birth control (low estrogen due to breastfeeding). I have not had a regular period which I equated to breastfeeding but have been feeling extremely nauseous just like I did with my daughter which is what prompted me to take a test. I am terrified ladies! I didn’t picture having another so soon (although I am thankful for this baby blessing and I know we are meant to have him or her) and feel guilty that my baby girl will have to share me. I didn’t have this fear when I was pregnant with my second daughter because my oldest is so much older. Any words of wisdom, comfort, or advice will be greatly appreciated!