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If you have been practising unprotected sex, there is always a possibility of pregnancy
. However occurrence of heavy period makes pregnancy less likely. Getting a negative report on home pregnancy will allay all your fears and keep the thought of pregnancy at bay. Hence I suggest you to get it done to clear off all your doubts.
The symptoms that you have are probably related to hormone disturbances or some infection. Maintain a healthy diet, adequate rest, physical exercises and destressing techniques might help you.
Hope this answers your query.
Wish you good healthy.