On the mini pill. i always take it on time but missed 3 days between packs due to the holidays. took it on time for 17 days, then had sex (with a condom and he didn't cum). now, my period is late. why? could i be pregnant?

Condoms work well: In a woman with regular periods, some causes of a late period include: excessive weight loss or weight gain, increased exercising, emotional stress, having an illness, traveling, medicines (like birth control pills), hormonal imbalances, etc… Seeing a doctor is a good idea if symptoms are persistent, recurring, or worrisome. If worried and no withdrawal period, can do a home urine pregnancy test.