Getting Pregnant After 4 C-Sections?

I am 24 years old. I have had 4 c-sections pretty much back to back. I had one in 2006, 2007,2008 and 2009. I was wanting to know if it was every possible for me to get pregnant again. I had to give up two of my newborn babies for adoption in 2008 and 2009. I know this sounds bad but I was in a bad position for a long time. Now that I am with someone good and my life is back on track, I want to try for another baby. I have been trying to conceive with my boyfriend since march of this year, and I have had no success. I have used ovulation tests and have always been ovulating. Every time I have intercourse on my ovulation days, I always end up having a period and a negative pregnancy test, so maybe I was thinking that I can not get pregnant anymore from having so many C-Sections. I never had any complications from my surgeries, So I was just wondering, will I ever have another baby?