my period came on 12th oct and the flow was negligible,so it again came on 31st oct...nice flow.i had protected sex around 10th nov,we used a condom,though it lasted for 2 mins,and he had to masturbate to cum after those two minutes,he masturbated for around 7-8 minutes after coming out from me to cum.my periods are now 18 days late....i had done two tests already,both negative....m scared i dont wanna get pregnant...also its not easy to see a doc,,mom accompanies me...plz help.