I am 21 days late past my period i have taken hpt and blood test all were neg... my husband and i had sex 4weeks ago so i know the least i will be is 4 wks along...im have period like cramping that comes and goes in my lower abdomen much like a period cramp... it is driving me crazy because i have heard everything from stress to you can still be preg because i have had the symptoms and everything to support such a possibility. My last preg i didn't show positive till i was almost 8 weeks preg... im almost to that stage now... i just don't understand why my body wont produce enough hcg to show positive until its too late.