I had this... was told its completely normal. Don't worry yourself too much. Our bodies will change inside & out & its scary because we don't know what's happening but unless you're not bleeding bright pink blood or having severe pains, just relax a little. :) Im 8 weeks tomorrow. :)
Sometimes the baby can cause some discomfort when frowning or moving monitor it if it should get worse or carry on tomorrow call your midwife and get yourself and baby checked out good luck