Thanks for your query.
Firstly, it is not the pills' effect.
Further, Home Pregnancy
Test kits can detect pregnancy as early as 1 day of missed period. a negative pregnancy test after a delay of a week, rules out pregnancy. The associated symptoms are similar to the ones which occur occasionally during periods.Irregular periods
along with whitish discharge gives rise to the possibility of vaginal/uterine infection
due to yeast, trichomonia or bacteria.
Consult your gynecologist who will prescribe appropriate medications after examining you for the nature of the infection.
Dr. Rakesh Karanwal