I have been experiencing nausea, fatigue, craving pickles and i have taken some pregnancy test and one came back positive and 2 came back negative ?

Pregnant: You are most likely pregnant and should see your doctor. On a side note however food cravings can sometime be a sign of iron deficiency. It's a strange reaction that isn't understood and only occasionally happens. If you're not pregnant you might ask your doctor to test you for iron deficiency.

Re do test : If you had sex since your last period and missed your period by 4-5 days, do a home pregnancy test. If the result is negative repeat the test 4-5 days later unless you get a period by then. Use first morning urine and follow the instructions for the test carefully. If you do not wish to be pregnant, use contraception all the time, every time. You may consider implanted contraceptive, or IUD.