What could cause this? feel nauseaus most of the day, though comes and goes in waves for about the past ten days, really off eating at the moment. Did three pregnancy tests last week, all neg, one last night, neg, then very very faint line this am. Could this be right? It just seems such a faint line am searching for other reasons could be feeling sick? AF not late, have not got period back since DD3 born (six months ago).