Hi...I just found out that I am pregnant for the 3rd time...in december I miscarried...To answer your question yes that can happen....with my last one and this one I had symptoms 2 weeks or so before a pee test would come up postive...I found out with both of them when I was 3 weeks....I will be 4 weeks tomorrow...2 weeks ago I started noticing that i was going pee more then normal...I didnt really think much of it....I was think maybe uti or bladder infection but the color of my pee was clear...then on the 30th I started getting nausus, cramping,having tender breast, having cravings and hungry all the time....I wasnt suppose to start my period until tomorrow but took a test on the 6th and both test was positive...good luck with everything