I have been having a lot of symptoms - nausea, diarrhea, hurting breast, mild cramps, fatigue, slight weight gain, frequent urination, more hungry than usual, missed period, etc. etc... All of the pregnancy tests I have taken are negative - I did use the first urine of the morning. Could I still be pregnant? If so, how long should I wait to re-test? My husband and I have been trying to conceive, and this is frustrating.