I fainted...

okay so me and my so have been trying gor our second baby and last saturday i woke up, proceeded to get in the shower when suddenly i felt everything atound me turn and turn and turn. i grabed myself from the wall but it keped going to i scream for my husband. suddenly i couldnt hear and felt all sick like i wanted to throw up, the moment he got there i faint in his arms. a couple of minutes later i hear him really far away trying to call for me to wake up. i tested that sane day but was negative. has this happend to anyone before? ive been feeling sick but i am afraid to get another negative.