opks getting lighter

period started 23rd Feb and finished by 26th. Did the first opk on the 29th cause we've been trying some time now and my periods are irregular so don't want to miss my chance at all. the first one was fairly dark but no where near as much as the control line, the day before I started getting a very light pink sometimes orangey colour watery discharge, it's calmed down now but still getting the occasional discharge but with no colour and all the opks since the first one are getting lighter and lighter. is it even possible I could of ovulate like right after my period or is my body just being weird? Any answer will be very appreciated