I want a baby...

I want another baby so bad... ive been having sex w my fiance for almost two years, no condom, and there were alot of times he didn't pull out... Nothing no baby, no pregnancy... and now we have been trying for two months straight, no pulling out, and still nothing no baby... should i be worried or just be patient??? Im 27,im at the point where i want one more baby before i turn 30...