 [ Symptoms ] i have been off my birthcontrol for about a month now and havent had my period could i be pregnant  my last period was on december 9th and that also is the last time i was on birth control i did have unprotected sex right after my peroid i havent had my peroid and i have been feeling more tried my breast at times hurt and tingle and at times i am a lil nauses could i be pregnant [ Disease ] replication is how a virus reproduces it simply makes copies of itself a copy is exactly the same as the original unless a mutation a mistake basically takes place when the dna is being copied in that case it becomes a new kind or strain of virus