I started doing my daily OPK on CD 10. On CD 16 I tested with two different types of OPK tests. One was an OPK strip i bought online and the other was a OPK stick I bought from the drug store. I collected a urine sample in a clean and try container. The OPK strip came out negative but the OPK stick came out positive.
The test line is clearly positive. Any ideas or comments on why this would happen? this is the only positive OPK I’ve seen during this cycle. Any help is greatly appreciated.
I included a picture.