Can pregnancy occur without any symptoms?
The only early pregnancy symptom I had was the missed period. I didn’t start the other “typical” symptoms until I was about 8-10 weeks. Other women can go the first trimester without any symptoms (lucky ones they are). The first trimester you may only gain about 5lbs on average so the gain/lose weight is almost irrelevant. There could be may reasons why you are having gas problems and tiredness. I would go to the doctor for a blood test. You could still be testing too early or not producing enough hcg in the urine for a pregnancy test to pick up.