I had anal sex last month 2 weeks after my period, and I have yet to get my period this month. It was early last month, could it just be late this month? Am I pregnant? Please help: I'm so worried.

I am concerned about my period, which as of today is a week late. Although I am not the queen of regular cycles, usually I am never more than two or three days off. My boyfriend and I are sexually active, and although I'm not on any form of birth control, we have been diligent and careful and always used a condom. We are each the others first partner though, and are still very much in a "trying this out" phase. He also hasn't been able to ever get more than an inch or so in, as at that point it gets to be too uncomfortable, so we have never actually had full intercourse. The last time we tried was at the beginning of June; we used a condom, again did not get beyond a slight initial penetration, and he did not ejaculate. We haven't done anything since. I took two pregnancy tests, one two days ago and one today, and both were negative. I know that the tests can be incorrect, but I don't feel like my risk of being pregnant is too high. Still, that leaves me wondering where my period is, and I wanted to post on here to see what another opinion might be. I am also getting my annual exam next week, and I plan to talk to my gynecolgist then too. Thank you for your time with my question!

I'm a virgin and engaged in foreplay with my boyfriend a few days ago. There was a point during manual sex where some preejaculate may have come in contact with my vulva in spite of the condom. According to the pregnancy assessment, my odds of being pregnant are low depending on various factors such as ovulation, sperm count, etc. But, as I hadn't started my regular birth control regimen yet and it only takes one sperm to fertilize an egg, to be on the safe side, I took Plan B. A few days later I had some spotting (brown discharge) and a little abdominal pain, which lasted about three days.

I have just a few questions about Plan B. As I understand it, Plan B can sometimes cause spotting and bleeding in women and can make a woman's cycle irregular due to the high dose of hormones being ingested. I've researched a couple of sites, but can't seem to find the answers to the following questions:

1.) What exactly causes the spotting and/or bleeding? Is it the shedding of the uterine lining or something else? Could it be considered a mini-period?

2.) Have there been cases of women taking Plan B correctly (i.e. within the time frame, one pill first, then the 2nd 12 hours later) after one act of unprotected sex, had spotting and/or bleeding and then discovered that she was pregnant?

3.) Does the spotting/bleeding for that month mean that the woman won't have her period the next month? If she does, does that mean that more uterine lining has attached itself to her uterus after her spotting/bleeding and she's just expelling the rest of it?