Spotting after fresh embryo transfer

I had 2 hatching embies put back this morning around 10:30am. She initially had a hard time finding my cervix but it eventually cooperated. Transfer was smooth. Now I'm getting some spotting pinkish brown stuff when I wipe mixed with cervical mucous. Has anyone experienced or was anyone told to expect this? I'm ready the post-transfer instructions and it's not mentioned. Thoughts? 

C.