I believe its ur intuition telling u. I had never been pg before and didnt even know anyone that had a miscarriage but right from the start i was saying that i felt like something was wrong.. i just didnt feel pg. Whenever i told ppl they wld just say im silly and too start being positive or i wld cause a m/c. It was very frustrating. But since I had never been pg or knew what a good feeling pregnancy was like i just assumed that it was just me being paranoid. I started spotting at 9 weeks, went for a scan and found out that baby had stopped growing at 5 weeks.. around the time i did the hpt. I felt like yelling at everyone 'See!! I told u!!'. Im glad that after a m/c u can request an early scan cos thats all i ever wanted with the last one but no1 listened to me.
A womans intuition is very strong.. we defintely dont give it enough credit.