Your fertile window is typically between days 11 and 21 of your menstrual cycle. Based on the dates given, February 6 and 19 were likely outside this period, so pregnancy is unlikely from those encounters. However, stay alert for signs like a late period or unusual tiredness.

Using protection during intimacy is wise, as condoms provide­ a barrier against potential pregnancy. Since­ your partner was past their fertile­ window, the likelihood of conception is re­duced. However, no me­thod offers absolute certainty. A faint possibility re­mains. Should she exhibit signs such as a delaye­d menstrual cycle or queasine­ss, a pregnancy test can definitive­ly confirm or allay concerns.

When you took apple cider vinegar to postpone your period, it may have had an impact on your body. If you notice any blood after that, it could be due to the vinegar interfering with your menstrual cycle. This isn’t very common but it can happen. It would be better not to do this with apple cider vinegar again. Your body will probably return to its normal state before long.

It's unlikely that your fiance is pregnant Birth control pills alter hormone levels, which can cause lighter periods. However, if you're still concerned, take a PREGNANCY test or consult a doctor Remember, birth control pills are not 100% effective at preventing pregnancy, so it's important to use additional PROTECTION if you're not ready to conceive. 

If you had an emergency contraceptive pill within 12-15 hours of intercourse, you are usually protected. It's common to experience changes in your period after taking the pill. Wait for your next period; if it's late or abnormal, do a pregnancy test. Also, using regular birth control methods is important to prevent pregnancy in the future.