Temping and OPK question

Okay so I just started temping and opks this cycle. I miscarried last month first time ever ovulating and first time getting pregnant. I took opks up until Jan. 20th then stopped because I was told to wait for a period to start femara because I figured I wasn't going to ovulate. I started opks again 2 days before an LH surge but missed the day before. I got a surge the morning of high temp from 97.4 to 97.7 . My temp today is 97.4 and negative opks does anyone know what this means ?