Ay, mama, that's concerning talaga, please go to your OB or the nearest clinic/hospital as soon as you can para ma-check properly, okay? Two lines then one line needs a doctor's guidance, hindi kami dapat mag-guess dito. A few of my mum friends kasi nag-experience ng ganyan at ang dami-daming reasons, basta importante talaga na makita ng doctor para sa ultrasound at proper check-up. Don't worry, just get checked right away para may peace of mind ka. Sending you strength, mama!