When a capsule of 100 mg of doxycycline was taken in the morning 2 hours before an fet would that affect the embryo or implantation? I had not taken capsules for several months now but when I saw the hives and swelling in my face I thought maybe it would go away. Just wanted to know if it would have affected the implantation of my embryo? I also take estradiol and inject with progesterone oil.