There is a 'sticky' at the top of the page re obstetric cholestasis. You are probably just itchy with heat/swelling etc but wouldn't do any harm to get checked out.
I was suffering with itchy feet last friday when I was in bed and phoned the assessment centre, they said to keep an eye and asked if my hands were itchy (they weren't) My feet were still itchy on the sat evening so I called them on Sunday and they asked me to go in for the blood test, just to be on the safe side. Results came back fine but at least they checked me to rule it out.