Input please!

So my boyfriend and I were VERY sexually active last month especially during my fertile window. Lately I have been having all the pregnancy symptoms such as nausea, tender/swollen breasts, fatigue, migranes, mood swings, change in bowels. The past couple days I've even felt as if I was about to pass out (though I never did) I was set to have my period last Monday and it came right on time but was much lighter than normal and lasted about 3 days longer than it usually does. I've taken 2 hpt but both came back negative. I still can't shake the feel that I'm pregnant. I'm not on any form of BC we rely on the withdrawal method. I would love some input from you ladies!  Should I give it another week and take another test? We currently do not have the money to go to the dr for a blood test due to DH starting a new job they hold his first check so I really won't be able to go until next month but i need to know now! I've been told you it's possible to get negative hpt a ways into pregnancy but how big are the chances of that? I really would like to have a baby but if I'm not currently pregnant I think we will wait a little longer.