Pregnant?

On may 13th my husband and I had unprotected sex but he didn't release in me ...my period was due on the 18th but I only had light spotting which seemed odd to me because I have never spotted ever. Then in the last two weeks I have had intense pregnancy syptoms I have taken a couple cheap test but all come back negative my next period is due in two days but my body usually tells me with discharge that is bloody ...so confused ??? Can I be pregnant and have negative test result???