Can having surgery delay menstral period for two months? surgery in march, brown spotted a week in april, nothing in may. negative pregnant test.

Not likely : Unless you had surgery for something very serious and complex is not likely to affect your menstrual cycle for such a long time.

Yes: Surgery is a controlled trauma to the body & the combination of surgery/anesthesia can disrupt the normal hormone patterns of the menstrual cycle especially of ovarian cyst drainage is involved. The regularity usually returns within 2-3 cycles.