I had sexual intercourse with a prostitute, and i was using condom, however at some point, i heard the latex tearing apart I instantly took my penis out, and the condom was completely broken at half, in the mid part of the penis; i instantly took some wet towels tried cleaning my penis, and the I used another condom to finish; when I finished I went to the bathroom to clean my penis in water, and I found a red spot in the skin, like in the mid-part of my penis, this was like 10 minutes later after the condom broke; could I have contracted an std? This was like 2 hours, should i worry?