Hcg blood test level under 2 @ 26 days after unprotected sex.i'm on the pill but took the 1st one a day later than usual by mistake. should i re-test?

See below: Did you miss a period after sex, if you did not, you are not pregnant. An HCG level of two 26 days after sex argues against pregnancy. You may wish to do a home pregnancy test in 4-5 days, use first morning urine and follow the instructions for the test carefully. If you get a period before that, then there would be no need for the test.