LH surge

OPK stands for Ovulation Predictor Kit. The OPK is a test that checks your urine for the presence of LH, luteinizing hormone. 

Fertility specialists currently use GnRH analogue injections to stop
spontaneous surges in LH (luteinizing hormone) in female patients being
treated with assisted reproductive technology.

There are three phases in your menstrual cycle – follicular phase,
ovulatory phase and luteal phase. In terms of LH surge, the ovulatory
phase is most important.

According to a new study, cell phones increase testosterone levels, but decrease the quality of sperm and fertility. 

Checking your cervical mucus for fertility charting can improve your chances of getting pregnant.

What is the best time to do Intrauterine Insemination (IUI)?

Can I use an ovulation predictor kit?

Which time of day is best to test?

If he has enough sperm, once a day is the preferred frequency of sex.
Having sexual intercourse after ovulation will not get you pregnant.