Should I appeal against my driving test?

I was thinking of appealing - I failed mine on Monday it was at 8.10 first 20 mins satnav was great no mistakes then it all went down hill the traffic was manic at a stand still up and down side streets but I thought I handled it all quite well anyway after finally getting out of traffic 90 minutes later got to the test centre still had to do my manoeuvre ok reverse bat park only all spaces took up by parked cars but I did it yay I was proud then results unfortunately you haven't passed today WHAT apparently undue hesitation at a junction omg really there was no safe gap to pullout until I actually did the traffic was at a stand still over to my left where I had to be and incoming traffic non stop to my right I had my instructor in with me and he agreed with me in fact I was thinking do I go for it a few times but it wasn't safe when the examiner got out the car she actually said right I'm going to have to run in now and explain why we have taken so long I'm confused do we pullout to save time or wait till it's safe and is it legal for her to have kept me and my instructor out 90 minutes for the test I was at the junction for about 5 minutes but honestly there was nothing I could do my test is due again in 2 weeks but I don't know what to do right from wrong anymore HELP