I need second opinions because I had my period last month on the 20th it ended on the 25th my ovulation was the 26 through the 30th. My my boyfriend and I had sex for the first 3 days numerous of times. I still not have received my period I have been extremely constipated extremely emotional little cramping but not menstrual cramps I feel extremely exhausted every day sometimes I feel nauseous but I haven't started throwing up I've taken a home pregnancy test but it has come out negative, other friends have told me that it is still too early to tell?.