welcome to Health care magic.
1.The placenta generally moves up as the weeks pass.
2.In your case its bit complicated, by the impression they have given. But you may continue. You need to be little more conscious, good followup, any spotting pain see your doctor and get
Ultrasound done.
3.Yes the bleed you had was due to the subchorionic bleed. It does resolve on its own depending on how big and
maternal health (BP,Any systemic causes)
4.Cephalic presentation means head of the baby towards vaginal / cervical side which is good for
pregnancy, but you have to consider after 30 - 32 weeks and above cephalic is good, now of no use ab baby position keep on changes.
5.Take a good followup, handle with care, good rest. wall the best !!
Hope it helps you. Wish you a good health.
Anything to ask ? do not hesitate. Thank you.