feeling guilty!

im having my 2nd baby (planned), very grateful and happy that so far baby is healthy! im just over 12 weeks and dont feel the need to announce just yet. i was going to tell my mum today but i just felt like i wasnt ready! i was busting to tell everyone when i was having my first! is it normal to feel this way when having your 2nd, 3rd, 4th baby or am i a "bad mum"?