26-30 day cycle & ovulate on the 14/12.this month didn't use opk.had egg white mucus on 10.dtd on 11&12.conception possible or not? if yes symptoms?

Pregnancy test: Conception, as defined by the generation of a fertilized ovum, occurs within day or so of the sex. However, it takes about 2-3 weeks for the embryo to make enough HCG to produce a positive pregnancy test. Blood test may be done a day after a missed period. Home pregnancy tests should be done 4-5 days after the missed period. If the result is negative repeat the test in 4-5 days. Use first morning urine and follow instructions for the test carefully.