Irregular menstruation can have an effect on pregnancy. Irregular menstruation can affect ovulation and can easily lead to conditions such as follicles not developing or not ovulating. You can go to the hospital for an ultrasound examination to see if there is normal ovulation, if there is normal ovulation will not affect pregnancy. The irregular menstruation may be caused by endocrine disorders, and can be regulated with estradiol valerate tablets and diacereal tablets under the guidance of a doctor. Endometritis, ovarian cysts and uterine fibroids can also cause irregular menstruation, which may also have an effect on pregnancy. If the irregular menstruation is caused by excessive stress in life, excessive mental tension, staying up late, etc., it will not have much effect on pregnancy. Therefore, whether irregular menstruation can affect pregnancy has a lot to do with the cause of the irregular menstruation. It is better to go to the hospital for the etiological examination and through reasonable regulation, it is better not to put too much pressure on yourself.