Here's my situation:
- I gave birth on May 27th, 2008

- My period returned on July 11th, 2008, and it has been on time every month since then

- My period was always on time within a day before i got pregnant

- I had protected sex the day before my expected period this month

- I'm not on birth control, but my husband and I use condoms every time.

- My period is showing no signs of arriving.

- I took one pregnancy test yesterday, and it was negative.

So, what's the deal? Am I pregnant again? Should I relax? I know I haven't been stressed at all this month, and I haven't really changed anything in my diet. I'm really panicking. Please help!
Thanks in advance.