I have 2 kids and am on my 3rd pregnancy, and have still never been weighed or had an internal check! They're not always necessary. And all those checks are what my midwife does too, and they are all that's needed in an uncomplicated, normal pregnancy, but you can always try asking for more if you're worried about anything. (I don't like outside interference so I'm very glad I've found a health professional who is relaxed and happy to let my body do it's own thing.)
If your from the UK that is normal. They don't do internal till your in labour or over due they so membrane sweep