In general, it is best to have a break of 18 to 24 months after the c-section and neonatal loss before conceiving again. Your body has time to heal both physically and emotionally. You must give yourself space to get better first before thinking about another pregnancy. 

Vaginal irritation can be caused by different reasons such as infection, physical or chemical exposure to the vagina and hormonal change. A gynecologist should be consulted for proper diagnosis and treatment of this disease. For now, to relieve the pain you may try comfortable and breathable clothes, no douching or use of scented products 

It’s fine if your period is late after taking Plan B because it messes with your cycle. Some symptoms like spotting, feeling sick, or changes in the timing of your menstrual cycle are pretty normal too. Remember that stress may also cause a delay in your period so try not to worry too much about it. Everything should return to normal soon enough.  If not though, then maybe think about getting a pregnancy test.

Most women do not get pregnant if they have sex 3 days after ovulation, but unfortunately, it's not impossible. Chronic alcohol consumption may contribute to a deficiency in the reproductive process and marital relations result in a baby's impairment. Mind the symptoms and take a test to be sure. Besides, take the test after you miss your period to know for certain. 

Sometime­s, period delay happens due­ to stress. If you only see spotting and no full flow, it might be­ hormonal changes caused by stress. Othe­r reasons could be lifestyle­ changes, extreme­ weight loss, or certain medicine­s. To get your period back on track, do relaxing activitie­s like yoga or meditation.