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There can be factors contributing to changes in vaginal pH balance and the occurrence of vaginal infections. Sexual activity, particularly with a new partner, can sometimes disrupt the natural balance of bacteria in the vagina, leading to infections like bacterial vaginosis (BV) or yeast infections. This can happen due to the introduction of new bacteria or an alteration in the vaginal environment.

In case couples choose to have no further children, then, "tubal ligation" which is commonly known as tube tying, is the most suitable approach to use. This process is successful and risk-free. However, when tubal ligation cannot occur maybe probably or fails, then, your partner can opt for vasectomy. Vasectomy is a brief surgical procedure that blocks the sperm from reaching into the semen hence no chances of causing pregnancy to a woman. After either of these two techniques has been done, none of them can be turned back to its normal state, so make up your mind about them wisely.

The pre­gnancy test and menstruation after taking nore­thindrone indicate you're like­ly not pregnant. Heavy blee­ding occurs frequently with this pill due to hormone­s. Though unlikely, pregnancy remains possible­ if periods persist irregularly. Monitor upcoming cycle­s closely, as flow intensity varies case­-by-case following medication. 

The possibility of pregnancy depends on the timing of sexual intercourse in relation to your menstrual cycle. Sperm can survive for several days, so conception is possible if you ovulated earlier than expected or have a shorter cycle. If you're concerned take a home pregnancy test after your missed period. 

If semen re­mains inside the condom without touching you, the risk of pre­gnancy is minimal. Occasionally, a penis softens before­ withdrawal. Ensure proper fit and usage to pre­vent future concerns. Unle­ss you notice unusual symptoms, stressing is unnece­ssary.

I advise you to go to a gynecologist immediately. Rashes in vaginal area can be a sign of a vaginal infection or a sexually transmitted infection.