Has anyone had these symtoms and been pregnant?

i have had all of the symtoms of pregnancy and feel pregnant i have been trying for a baby for two years now but last month and this month i have had spotting for one day each time i usually have a normal period for 4 days and this is strange for me as it is also a bit brown in colour and i have cramoing all the time no too bad though i have had a test about 2 weeks ago and it was negative but i have had problems in the past with low hcg levels please can someone help me asap thankyou stacey