Menstrual irregularity isn't a sign of pregnancy but can be a sign of some type of disorder that also manifests with sterility. Menstrual irregularities (rare or frequent menstrual periods, short or prolonged menses, weak or strong menstruation) are usually signs of disturbances of the endocrine axis of the hypothalamus-pituitary-and ovaries. During such disturbances, ovulation is prevented. Without ovulation, conception is impossible. Menstrual cycles without ovulation are irregular or sporadic in nature.

It doesn’t seem likely that you are pregnant but you can take a pregnancy test to confirm or exclude the possibility. Furthermore, you can consult a gynecologist about your sterility problem.
Your husband can request a sperm analyses to get the process going.