My last period was june 21. i had unprotected sex the 30th, the 2 of july and the 4of july . yesterday and the day before i had a little brownish blood on toilet paper. could i be pregnant?

Possible: With first day of period june 21, you would have ovulated about july 5, so the 4th was your best day and the 2nd was close. The brown spotting could be from intercourse and old blood from your cervix or bleeding from ovulation. If you conceived, the embyo would be just now implanting or in the next couple of days. You will know in 2 weeks if you are pregnant but it is possible.

Speculation: Given the limited data you provided your sexual encounters happened on days 12 to 16 of your cycle. So, yes you very well could be pregnant. If your next period is delayed then it will be time for testing. I would hope that at age 19 you know how to prevent pregnancy. If you need access to health care there is planned parenthood in tuscon. They can not only provide you a pregnancy test, but bcp.

Maybe!: You certainly could be pregnant based on the fact that you had unprotected sex in the middle of your cycle (which is usually when you ovulate). The best way to know for sure is to take a pregnancy test whenever your next period is due. If you're trying to get pregnant, this is the way to do it. If you're not trying to get pregnant, i recommend seeing a doctor to talk about birth control options.