is there anywhere I can get blood tests for pregnancy other than at my Drs?

I have asked my doctors to book a blood test for me to see if I'm pregnant as I haven't had a period since July, my boobs are getting bigger and for the past 3 weeks I've been getting head aches and cramps that causes back ache. I'm sleeping loads and have been feeling quite sick during the day. they have refused as I haven't had a positive test yet but all the symptoms are there. are there other places you can go to get the blood tests done? I've officially given up with my doctors as when I went last month because I'd missed a period, she only prescribed me the pill after I told her I am trying for a baby...