Why am I feeling tired and sick after taking the pill and anti depressants?

One extremely important thing to do is to investigate the possible reasons for your periods' absence. Weight gain and feeling thirsty might indicate struggling with various issues, such as chemical imbalances or thyroid problems. There are multiple other excuses for your feelings. I hope you will go to a doctor to check what's what and get the right treatment.

It's common to miss periods.. Stress, illness, medications cause changes. Take a PREGNANCY test. False negatives occur if done too early. If it's negative, wait a week and test again. If still negative see a doctor..

A faint line on a pregnancy test may lead to one assuming that they are positive but next is to verify with a doctor or obstetrician. 

There is nothing to worry about the white discharge as it is completely normal in teenage girls.Hpwever if the discharge is accompanied by other symptoms such as itching, etc you need to see a doctor for treatment.

Your cervix feeling low is concerning and may indicate a prolapse, which is when reproductive organs sag down. Symptoms include a heavy pelvic sensation and a vaginal bulge. Prolapse can be caused by pregnancy, childbirth, and aging. Treatments range from pelvic exercises to surgery, depending on the severity. 

The result you provided, 2622.43 mlU/ml, indicates a positive pregnancy test. HCG levels vary among individuals and throughout the stages of pregnancy, but a level of 2622.43 mlU/ml is consistent with a positive pregnancy result, indicating that your wife is likely pregnant.