Have hot flushes, sickness and sore boobs replaced that initial glow?
Crying when you're not the crying type, or feeling yourself constantly moved to tears at an advert/cute baby/sad song on the radio, could be a sign that you are pregnant. Pregnancy hormones are to blame, once again, and this, mixed with the usual early-pregnancy anxieties, tends to accelerate the crying process, especially around the sixth week of pregnancy.
Help yourself... by reminding your partner and close friends and family to be gentle with you. Give into it and have a good cry - and remember, it does pass! Don't forget the tissues...