I was physically activeon 1st of Jan without protection , and ejaculation was done outside, still I had unwanted 72 with 2 hours on 14th I experienced light bleeding for not even a day my periods date was 23 and still I didn't get periods , last week I did a urine pregnancy test but the result was negative , should I do a blood test I'm worried why it's late I don't have any pregnancy symptoms , I have joined gym more than a month is it because of that or something else , please suggest thanks