經(jīng)常上夜網(wǎng),會(huì)使經(jīng)期不正常嗎?延時(shí)或早來?我都過了4天了,還是沒來,但這段時(shí)間跟我老公做,沒有避孕,會(huì)是懷孕了嗎?