If you are 3 or 4 weeks, the very first sign would a positive HPT or a missed period.. Have you taken a home
pregnancy test yet? was it positive? if so there are a multitude
of signs...just like each person is different so is each pregnancy...signs vary from person to person you can have all the signs are one sign...in early pregnancy commonly all you will feel is sore boobs, faitigue and a headache...but again, the best and most reliable sign is a positive HPT followed by a Postive blood test.