Hi , we had sex on 27 Nov, but I didn't release my sperm and I didn't use condom though. She got date on 8 DEC as usual. But since 2 days she is feeling nausea , headache, and feverish. Is there any chance she get pregnancy. What is the best way to check

She might just have a cold or flu from the symptoms, and likely she is not pregnant since she didn't miss her period, but unprotected sex can lead to pregnancy easily. Men can release small amounts of sperm throughout the act of intercourse before he finally ejaculates.

Even though no birth control method is 100% guaranteed except for abstinence, you both should be using one or two forms of protection each. That reduces the chances but as I said it doesn't eliminate them. The prime indication of pregnancy is a MISSED period but many things can delay a period by a day or a week, and home pregnancy tests must be taken a few weeks AFTER a missed period with first morning urine to help reliability. It's still a wait and see situation.

Any time you engage in intercourse a man can impregnate a female and many females get pregnant using more than one birth control method.

Many women have bleeding the first period after getting pregnant. It isn't really menstruation with tissue, just light bleeding. So there's never any guarantee.