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You had sex with your partner few days prior to expected date is considered safe period as ovulation take place approximately 14 days prior to start of your period.Hence chances of pregnancy
is almost nil but it is not 100%
But to depend on ejeculation out side is very risky and you can get pregnant in any cycle.
Now what can you do is to wait for your period and if it is delayed take urine pregnancy test and further action depends on result if it is negative and you get period then it is fine, if positive then consult your Gynecologist to continue or go for MTP
Once you get your period you should use one of the more reliable contraceptive
methods in consultation of your gynecologist like OCP
,IUCD, or Barrier methods
Hope this information is useful to you.