Showing signs I’m fertile but OPKs —

First time on clomid. I have a luteal phase defect so they are trying clomid to help me Ovulate stronger. My cervix is showing signs I’m going to or about to ovulate. I also have watery mixed Egcm but my OPKs are super negative!!! Like there was barely a second line this morning. Can OPKs be wrong on clomid?