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If a girl has sex before her expected period and then it comes on, she is likely not pregnant. However, some women may have light bleeding or spotting in the early weeks of pregnancy which can be mistaken for a period. If your girlfriend’s cycle was normal with the usual flow for 3-5 days then she is probably okay. Periods are sometimes irregular due to stress among other things so I wouldn’t worry too much about it unless there are other signs as well. 

Terminate a pregnancy at home without medical supervision can lead to serious health complications and not recommended. Please consult a qualified specialist for further guidance.

Stress, weight fluctuations, and hormonal imbalance are some of the factors that can cause a delay in your period. As you had protected sex and your period is late only by 10 days, it is unlikely you are pregnant. 

Genetics might be one reason, or perhaps there are some constraints on growth. Sometimes this isn’t significant but follow-up with a healthcare professional is necessary for more assessment and observation. They will direct you accordingly so that the health and growth of your little one are right on track. 

Yes, a ruptured ovarian cyst during pregnancy can cause bleeding. Talk to your doctor for further evaluation 

The white spots around your vulva could be a sign of severe bacterial infection, named as Bacterial vaginosis. It is recommended that the condition be confirmed by a gynecologist who can perform the necessary examination and diagnosis. Depending on the severity of the infection, additional treatment with antibiotics will be prescribed.

Its normal if your period gets delayed by a few day, there's nothing to worry about.. Stress, adn hormonal chanegs can also lead to a delay in your periods.. Apart from that pregnancy is another factor and if you are concerned its important that you g et it checked.