Ovulation

Lovemylife • Mom to two awesome girls. 1 MC. Had my rainbow baby boy 6/5/2017!!!! So in love 😍
Question- i have been taking opks since Monday. Got my first def positive wed and continued taking them every day just to see n got another def positive today but yesterday was negative or fading like it was going away so I thought it was going away until today I took one n got a def positive. Is this normal? Why would I have two surges?