Is it safe to have vbac?

I am 32 weeks with my 3rd child. I had normal birth with my 1st. C-Sec with my 2nd due to him being breech. During the c-sec i lost 3 litres blood which has scared me out of having another c-sec. With this pregnancy i have had a mini stroke and my doctor has put me on a low dose aspirin. Therefore i would bleed alot more if i had another c-sec. I have big babies and i guess i am just scared that i wont be able to go through labour naturally and therefore would need a c-sec. I guess i am just being fearful that something may go wrong. Should i just opt for c-sec or try and go it with the natural birth?? eeeek?!! Any advice would help.