Hi,I have been taking 500mg of metformin since 10/18 due to pcos., I spotted on and off for 2 weeks straight, then it stopped. and for the past 3 days Ive been feeling alot of nausea, moodiness,breast tenderness, period like cramping and lower back pain., but no period., I took a HPT and it was negative., could all these symptoms be early signs of pregnancy? and i took the test to early?