Nikie1, it is the start for sure but it may not really kick in for days or even another two weeks or more. Sorry!
Baby is settling down and putting pressure on nerves etc which causes the shooting pains, this is normal, sounds like your mucus plug is coming away a bit which, again, is normal.
Best advice is not to dwell too much on these early labour signals, but to keep active, eat and drink well, make sure you go to the toilet also, walking is good, swimming will give you immense relief, get as much rest in between as you can and generally be prepared for a bit of hard work!
Plan something nice for every day, massage from dh, lunch with a friend, manicure, pedicure, gentle walk in the park on nice days, etc, whatever you find pleasurable anyway! Then when you suddenly find you have to cancel these plans cos labour acutally is happening you'll be delighted!
Early labour mistakes