My friend is very worried she could possibly be pregnant. She was on the deposit for 4 years and just got off in October. She has yet to have a period so she isn't able to track her ovulation. She had sex on new years <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a> and told me they didn't use a condom. How can she know when to take a pregnancy test?