Talk to Gynecologist on Gynecology

aoa i have 2 kids via c section youngest born 1.5 years my last period date was 17 April I skipped in may husband is using protection also 8 days ago I took a tablet to have periods and after 5 days again took it now there is still no sign of periods I did strip test today twice with gap but the strip is negative what could be the reason I don't want to conceive again can I get injections to be more precise