Pregnancy doubt. I take any medicine?

So me and my partner was just making out on 7th January there was no penetration there was no sex  it just we think he ejaculated near my vagina or maybe on the bed where we laying so 19 or 20th January was my periods date and today is 29 of January and in the morning there was light bleeding just water so i think my periods arrived and now there is no bleeding it's just stop all of sudden and i do have pcod also. Is this a implementation bleeding am i pregnant ?? How it can happen if there's no penetration at all ?? And i am also havin turmeric in warm water from last two days is this bleeding occurred because of turmeric water or i am pregnant ?? Please help should i take any medicine ?? What should i do