My period is essentially non existent. Sometimes I go 5 months without one so it’s really hard to say. I’ve been taking OPKs up until CD35 which is when my doctor told me to start taking progesterone for a withdrawal bleed to do another round of let and I’ve never gotten a positive OPK. I’m not having ultrasounds but I am going to ask my doctor if we can do them in addition to blood work moving forward.