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You can repeat UPT on 24/3/2011 and if positive mange accordingly,but there are least chances of you being pregnant .moreover you have not mentioned when you had unprotected sex.,if it was in safe period then there is nothing to worry.
If again UPT comes negetive and then you can take homeopathic
medicine Pulsatilla 1M 1 dose once in a day for 3 consecutive days.
Hope this helps to clear your problem,
dr jignesh parmar
Our Motive "Heal well Heal Fast"