Had intercourse on 9sept. Done a bhcg test that was 0.4 on 9oct. Also do a urine pregnancy test on 27nov that came negative. Pelvic usg scan done on 9oct, diagnosed with pcod and nothing else. The reports said that there was no gestational sac. Had my periods on 21sept then on 2 Nov. But the period flow was low , also the menstrual pain was low and it stopped after only 1-3 days of flow (my periods were never like this before). Now I think I'm a little nauseated and salivating a little more than usual and feeling anxious. Is this because of pregnancy or something else??? Please guide me.