Vaginal Contraceptive/Natural Birth control

Gada1408

Hello

There is few questions to ask:

1) How safe is it to have protected sex on 12 /13 days from the last Cycle ( Period cycle regular 28 days cycle)

2) As an extra precautions can you please guide me about
Vaginal Contraceptive - are they safe and do I need doctors prescription to buy ?

3) Any Natural Spermicide or Birth Control which can be used along with Condom or can be insert in vagina via water/oil/gel form