Vaudha
Try not to worry
170 is ok. Baby's HR goes up and down and will depend on many things - mainly the amount of catecholamines ie adrenaline rushing around your body, any caffeine you have had in the past 12 hours (the time it takes to metabolise caffeine in pregnancy) and whether baby is active at that particular time or sleeping, or just waking up etc. At this stage baby is behaving as if it would as a neonate - with fluctuating HR depending on circumstances like the ones ive mentioned.
If it was 190 - 200 and then dipping down to 120 etc that would be worrying - but get it checked again in a few days and Im sure you will be reassured.
ejsmom welcome!
Update from today

Had a growth scan and baby is on 70th centile for head and abdo and 50th for femur.
Very happy and relieved. Also she has turned and no longer breech.
My consultant said that meant we had to raise the question of me delivering normally. I have always been convinced that I want a section, given my personal experience in anaesthetising women who have failed to deliver normally and needed c section in the middle of night etc. I had decided for a planned, controlled section, esp with my GBS.
My consultant today said that this pregnancy was NORMAL (!!!) apart from my stitch and the GBS (which all seem abnormal to me but...) and that I could be induced at 37+4 with antibiotic coverage, have the stitch out then and some prostaglandins, and have a controlled normal delivery if i wanted. He is just giving me the options and opening me up to the idea of delivering normally - but it has thrown me !!! big time... Maybe because I am a control freak and just want this babe out safe. Tried to discuss with other half a few times today but he is very much - wait and see how you feel nearer the time (which is probably what I would say to me) - but my mind is racing now and going through various scenarios in my head. Funny what this pregnancy malarky does to ones capacity to concentrate.
Suddenly we have gone from being convinced I might not get to 28 weeks - to "you can deliver normally" .... such a shift in attitude. anyway - its food for thought.
As for the hair/progesterone thing - I would have taken it if offered - hair or no hair - a healthy baby is whats important.
Bye for now
x