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It is very less likely to get pregnant by rubbing genitals. The decreased amount of bleeding during menses and excess mucous secretion could be because of other hormonal changes in her body. But when in doubt of pregnancy if otherwise, you can always do a simple pregnancy self test at home.
HOME PREGNANCY TEST
A home pregnancy test measures the presence of the hormone human chorionic gonadotrophin (hCG) in your urine.
This hormone is first secreted at the time the fertilised egg implants in the uterus (about six days after fertilisation) by the cells which go on to form the placenta.
Home pregnancy tests may be purchased without a prescription at most chemists and pharmacies
You can test any time of day, and as early as the first day of your missed period for most tests
• First, read the directions carefully, because the instructions will vary with different brands.
Some require you to pass urine in a sterile container and then, using a dropper, place a small sample into a testing well. Others let you pee directly onto a stick. But, fundamentally, all pregnancy tests work the same way; they measure the amount of hCG in your body
Result interpretation : Some change the colour of the urine sample, others show pink or blue lines on the test strip, reveal a red plus or minus sign, or the actual words "pregnant" or "not pregnant", in a window.
You can check the results in about five minutes
If you follow directions to the letter, home pregnancy tests are 97% accurate
Perform the test first thing in the morning when your urine is most concentrated.
If you have a negative result when you first test, it may be that the levels of hCG have not yet reached a level where they can be detected by a test, even by the day your period is due, so you may want to wait a few days then test again.
If you are doubtful of being pregnant after performing the test, you must consult a Gynecologist immediately and seek for conformation of pregnancy.
Hope this helps. Feel free to ask if you have further queries.