Cheating BF cause Vaginal Infection?

Okay I am soo freaked right now, that I even created a yahoo user freshly to ask this question.I only just had unprotected sex for the first time, near my bf who I trust (maybe trusted) deeply, but who also cheated on me back a very long time ago. Now a couple days next my vagina is giving off this horrid odor. I'm freaking out.possibly he cheated on me again with some dirty $&**!! And in a minute I have an infection or worse! At this point I don't even perfectionism if he cheated, all I comfort about is my form! He'll get whats coming to him subsequently if he did. So beside that I did hear b4 that once semen is left out for long period of time it can smell, maybe his semen is still inside of me?? Or conceivably his semen caused an allergic hostile response?? This happened just about a week ago, and then I have my period, which be only three days.did my spell mixed with the semen do bacterial growth? Or is my BF just a disgusting &@$?! I've never have this happen to me b4, but I other used a condom b4 too! Help!
Answers:

Has anyone ever had a Laparoscopy??

first of adjectives, try to relax. you're ok. regardless of you BF's fidelity. i had a similar experience similar to this. found out it was BACTERIAL VAGINOSIS. this is another form of a yeast infection. it's not an STD. BV cause a "fishy odor" to come out of your vagina.
or it could be TRICHOMONIASIS. that is an STD. that cause odor, discharge & irritation.
both these things can be cleared up within a few days next to antibiotics.
my advice - move about to planned parenthood & get hold of tested; if it's trich, he's a cheating bastard. if it's BV, he didn't give you anything.
honourable luck!

Is it true that the cramps that come with period are more painful after you own more children?

it is possible that you have an infection from his dirtiness. Dump his seriously, not a soul deserves that *. Sometimes womens vaginas can get a odor, could it be from his semen inside of you... possibly all women are different. There is this STD call Trichinosis. or something like that, google it.it is described at a fishy odor. you can go and get an antibiotic (if thats what you have) and it will get rid of it. I read once that it is noteworthy to treat it bc it makes you more susceptible to HIV and AIDS. Go to planned paternity or your doctor if it continues. Just do not use a douche because if u then progress to the Doctors they may not be able to detect any nice of problem or infection. GOOD LUCK