Positive OPK for three days?

Is it normal to have a positive OPK for three days? I’m on CD 20 now and still getting really positive OPKs and this has never happened to me before! I have an ovarian cyst on my left ovary so don’t ovulate if I try from my left ovary and just have a breakthrough bleed instead, but when I do it’s normally around CD15-17 so really confused! Thank you x