you do not tend to take notice of any changes until maybe 2-4 weeks after intercourse. After intercourse, if a woman conceives, the egg will not implant itself until 8-12 days (so almost 2 weeks). After Implantation, a woman might then notice sore bbs, implantation bleeding (which is almost like a period but differrent & doesnt last as long), and a missed period.
She should really take a test if unsure, that is the only way to tell.
Good Luck
Thanks for your response, but would you mind if I asked how long after the sex was it you noticed this, 3 weeks?
for me i felt really sick! all the time, then a missed period and sore breasts.