A lice-killing lotion containing 1% permethrin or a mousse containing pyrethrins and piperonyl butoxide can be used to treat pubic (crab) lice. These products are available over-the-counter without a prescription at a local drug store or pharmacy. These medications are safe and effective when used exactly according to the instructions in the package or on the label. Lindane shampoo is a prescription medication that can kill lice and lice eggs.
Trichomoniasis is another type of vaginal infection. It is caused by a single-celled parasite that is usually spread through sex. In addition to causing bleeding after sex, it can also cause vaginal discharge and itching.
It's not possible to feel symptoms just one week after sex. It takes the female body about 2 weeks to produce the hormones that make you feel those symptoms. My first pregnancy it took me 2 MONTHS to even get any symptoms which were breast tenderness, missed period of course, and a little weight gain. It is not likely.