I had a medical abortion at 6weeks on may 10 . i had unprotected sex on may 15th and 17th and now i'm having headaches . can i be pregnant again?

Too soon to tell: Conception, as defined by the generation of a fertilized ovum, occurs within day or so of the sex. However, it takes about two 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 you do not wish to be pregnant, use contraception all the time.