Do you miss your period completely with no spotting or nothing the same month you have sex during ovulation?

If pregnancy occurred during this month, the next "period" will not occur. If your periods are regular (24-32 days apart) , a delay in menstruation can indicate a delay in ovulation which will extend your cycle. Obtain a serum HCG test to be certain about pregnancy.

Can. Conception occurs within day or so of the sex. It takes about 3 weeks for the embryo to make enough HCG for 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.