Good Afternoon,
Antidepressants as a group do not seem to have any universal effect on women's menstrual cycles, but in some women there may be changes either in the cycle itself, or in the menstrual period. This appears to be a specific effect for that woman if it occurs, and not a general effect of the medication in a group of women.
Therefore from what I have read this could cause your problem. Take care.
Kindly,
Kitt