Your symptoms suggest an impending period. You cannot be pregnant as you had the intercourse at the time of your expected period and added to that, you took emergency contraception
. The period can be delayed due to the hormonal
disruption created by the pill. Also, return of ovulation after cessation of oral pills
can take one or two cycles. You cannot expect a pregnancy
test to show up anything now; it should be 3 weeks from the intercourse for HPT to read anything. If you do not see your period in the next week, see a specialist for further management. Hope this helps.