Later at 14 I started missing my period for months and when I did get it it was incredibly painful. Now at 20 I can go a year without one. The only way it comes every 28 days is if I'm on birth control pills and they make me throw up so I stopped taking them. I know to get pregnant you have to track your period and ovulation but how in the world can you do that when you don't ever have a dang period? I mean I'm not complaining I HATE my period. But I'm worried about conceiving.