Alright guys, so this question is obviously nothing new, but I'm a little panicked and would love some advice from anyone who has good information and/or has been through a similar experience. Here goes...

So, on the very last day of my period (there was little to no bleeding, since it was basically over), my boyfriend and I had sex. This would have been about day 6 or 7 of my cycle. We've always been extremely careful and responsible...but this time we weren't. At all. I'm not on birth control, so we usually use condoms, but this time we didn't, and he didn't pull out early enough either. The next morning I went to get Plan B, so less than 24 hours had passed (maybe 18) between unprotected sex and taking the pill. Exactly 7 days after taking the the pill (I guess I should be ovulating around now...) I started bleeding. It's not my period, because it just ended a week ago, so I did a lot of research and I'm fairly certain what I'm experiencing is withdrawal bleeding from all the hormones leaving my system, which is not an uncommon response to such a high dosage of hormones. I was suspicious that it may have been Implantation bleeding, but that's much less common, is not as heavy of a flow, and typically doesn't last more than a day. This is day 2 of bleeding and it shows no signs of letting up. Unfortunately, withdrawal bleeding is no indicator that I'm not pregnant, so there's still the possibility. So if we had sex on day 7 of my cycle, and I would ovulate around day 14  or 15, then I suppose I should be alright. However, the longest living sperm can last up to 5 days in the female body if conditions are optimal, and there's always the chance of ovulating a little early. The good news is, on the last day of your period, conditions are NOT optimal so sperm would generally only last about a day or two at most. So I guess I would have had to ovulate a little early AND a bit of sperm would have had to survive for the maximum (and less common) 5 or 6 days for me to be pregnant....but the thing is, I still have pregancy-like symptoms. I don't know if this is from the plan b and the large amount of hormones, or if I'm pregnant. Obviously there is the withdrawal bleeding, but I also have tender breasts and fatigue and bloating. I've heard these can be symptoms that occur about a week after taking plan b because of the drugs/hormones leaving your body, but I just don't know. I'm most worried about the bloating because I don't know if its a baby or hormonal stuff because every is out of whack now!

So guess my main questions are:

-What is the likelihood I'm pregnant?

-Do these sorts of symptoms occur after taking plan B? or are they pregnancy symptoms?

-Would taking plan B stop ovulation for  this month? Would it merely delay it a few days even if ovulation was still a week or more away? Would taking plan B have affected my ovulation at all if ovulation was a week or more away? If I'm experiencing withdrawal bleeding, can I still ovulate at the same time?

-How long does withdrawal bleeding after taking plan B last?