I have been taken prenatal vitamins an haven unprotected sex how will I no if I'm pregnant be from my period next month?

Urine pregnancy test. Take Folic Acid >1 mg daily and check a urine pregnancy test (over the counter, can be performed at home) 1-10 days after a late/missed period for a 90-99% accuracy. Of course consult with your gynecologist as well to make sure you are fit for pregnancy and have taken all preventive measures (flu shot, etc).
Pregnancy Test. Wait about two weeks and take a pregnancy test. Symptoms may include: spotting and sometimes cramping(that's called implantation bleeding. It occurs anywhere from six to 12 days after the egg is fertilized.) tenderness in breasts, fatigue, nausea/vomiting, frequent urination, headaches, back pain, constipation, and the big one is a missed period. Hope this helped :].

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My period stay on foot 7 days just had unprotected sex an now taken prenatal vitamins can that help me conceive?

Conceiving. Prenatal vitamins are excellent to take when you are trying to conceive and unprotected sex is also a great idea. Some other helpful hints are: exercise, at least 30 minutes a day 5-7 days a week, eating a healthy diet including lots of fresh fruits and vegetables, getting plenty of water and sleep (at least 7 hours if you can!). And something to help with stress.... Walking, yoga, warm baths. Read more...