What are the normal ranges of hCG levels in non-pregnant and post-menopausal females?

There is still the possibility of getting pregnant if you have had unprotected sex three days before your period is due. This is because sperm can live for a few days inside the body. Not having your period might be a sign that you are pregnant. If you’re worried, after missing a period you can take a pregnancy test to find out for sure. 

It is completely natural to be concerned about a late period, even after having your tubes tied. Here’s the thing though – not having a period can occur for many reasons besides being pregnant. Stress hormones changing up or certain drugs could all cause your menstrual cycle to go off kilter. Taking a test can help ease any worries so if this is something that is worrying you then go ahead and do it. 

Breast pain could be due to many reasons including hormonal changes, breast cysts or fibroadenomas. I propose that you consult your gynaecologist for a clinical breast examination and possibly a breast ultrasound to find the underlying reason of the pain.

The chances of pregnancy from the described activity are generally low.. but not impossible. If you both are concerned it's best to take a pregnancy test after her next expected period. 

It's generally recommended to avoid alcohol or to consume it in moderation for those who are trying to conceive or are already pregnant. 
Even if its 5% alcohol beer in moderation and may not have a significant impact on fertility or pregnancy outcomes, it's important to know that every person and pregnancy is unique.

Commonly, a contraceptive called plan B can lead to some irregularity with your monthly cycle. A delayed period can be your pill or stress because you are scared of getting pregnant. You might face side effects such as bloating and breast tenderness. To be sure if you are pregnant, perform a pregnancy test 7 days after your missed period.