Is it likely to get a false negative at 12 weeks pregnant? I didn't use first morning urine, but the box said it was only necessary for early testing. Also, I have not missed a period, but a few of them have been an odd flow. Ive had a total of 6 (i'd be 22 weeks now, ) I was fine after the test, but now I am feel odd feelings in my stomach (nerves? Im under a ton of stress, and I have no other pg signs) and am worrying the test was wrong and I may still be pregnant? Is this likely? Or even possible?