I had my last period on 14th nov.i had sex on 15th nov.we didnt use condom the whole time,had pill in the last. from 16th i had been feeling bloating, nausea, headaches, backaches.from 17th-20th i have had spotting. on 21st im having bleeding.why?

Pregnancy worries?..: It can be hard to guess whether a woman is pregnant or not. A urine pregnancy test gives a reliable result by 3 weeks after sex (3 weeks after when conception might have occurred), 1 week after missing a period, or after having a "weird" period. If done sooner, a positive result is likely real, but a negative result may be due to testing too soon. One can also see her primary care doctor for exam.