Depo-Provera prevents pregnancy by stopping ovulation (the release of an egg by your ovaries). It thickens your cervical mucus, which makes it hard for sperm to reach and fertilize an egg. It also thins your uterine lining, which makes it hard for a fertilized egg to implant, or attach, to your uterus .
A urine home
pregnancy test HPT usually becomes positive within a week or so after implantation, or around the time of your expected menstrual period. It becomes positive about12-14 days days after ovulation and fertilization.