Strange question

So I only have one ovary. .. I had to have my right ovary removed 4 months after that I got pregnant and had him last December. Well now my husband wants one more baby and I know my fertility is cut in half since I only have one ovary... does this mean that I can only get pregnant every other month? When my left side ovulates? The doctor never explained it to me after surgery and we don't really even know how I got pregnant the with my son last year