Does regestrone has anything to do with negative pregnancy test? I m having PCOS problem frequently,so took regestrone (1 tab each day) for 5 days as prescribed by doctor earlier, but also had sex with husband last month on 30th june,and date of my period was 5th july, and when it got delay i took regestrone from 15th july to 19th and as for concern tested the pregnancy today(21st july) which showed negative, i just want to know if this test is negative just beacuse of regestrone???