Suggest Remedy To Avoid Possible Pregnancy

hi im 19 yr old. i had my last periods on 12th of jan. and on 26th jan i had sex with my faince for the first time with condom. and we repeated it on 27th also. but on 28th we had unprotected sex but the thing is he didnt insert it. just touched my vagina. so is there any chance to conceive? and what are the natural ways to abort?