Pregnancy guilt

Found out a few weeks ago that I was pregnant, currently 7 weeks and 2 days pregnant and I’m struggling with acceptance of this pregnancy. I currently have 3 kids and this would be my 4th and I’m really battling with the ability to care for another baby. I don’t really believe in abortion but I know people deserve the option and it’s been heavy on my mind. I can’t believe my birth control failed I’ve been trying to get my tubes tied for 2yrs and keep getting denied. Nobody around me understands how I’m feeling. Just feel completely alone, sorry just venting!