ovulation symptoms, negative tests?

what is going on?! so I've got an excessive amount of clear, watery, odorless discharge for 3 or 4 days now. like ALOT. my cervix is definitely low because sex has been uncomfortable or painful the past 3 nights and yet im getting negative opk. they're getting lighter and lighter. im on cycle day 18 now. to add i am on Clomid 100mg