Can you have negative blood and urine tests and still be pregnant?

I started seeing my period on Aug 16, 2011. I was therefore ovulating around Aug 27 to Sept 1. I took my birth control every day up until Aug 27 but the last time I had sex was the day after (Aug 28) , which was clearly during my ovulation period. Three weeks later i started having nipple secretions. I tested my hormone levels of prolactin and they were a bit elevated but my DR said that that usually happens to some women and it will go away on its own. Every month since my period has been on time but where it usually lasts for 5-7 days, now its only been lasting for 3-5 days and one instance two and a half days. I still experience nipple secretions. I've had 4 negative HPTs and 2 negative blood tests. Im always tired, I throw up from time to time and for about the last 10 days i've been feeling something moving around in my lower abdomen and my belly is getting bigger. PLZ HELP ANYONE!!!

[Clysta]

You would be around 19 weeks pregnant by now, a pregnancy test would have shown positive. Go back if you still don't believe your doctor. Ask for an ultrasound or beta blood test to find out what your hCG levels are at. If they're under 5 you aren't pregnant.

[Morrisfamily2012]

Not sure what's going on with you, but when my mom was preggo with me she had a.normal period all the way until 5 months. She didn't know she was preggo until then. So my point is you can have what seems like a period thoughout pregnancy. Go get checked out by a dr. ask for u/s and blood test. Be sure to tell them everything that's been going on.