Okay, noooow I can offer some perhaps better explanations.
While ecstasy can be the perfect tool for working out issues, you really need to go into using it with that set and frame of mind. Taking it just to lighten the mood is like trying to ignore your issues for the time being... And with a drug like x, typically that ain't gonna happen. Whatever you're feeling is going to be magnified and will at some point come out.
If you felt a bit tweaky, odds are your pill had some sort of speedy cut to it. That could be anything from a bit of caffeine to some sort of amphetamine. This isn't necessarily a bad thing (I prefer slightly speedy pills, because I like to dance and be active at parties and such).
If these pills were indeed a bit speedy... Then that could have also caused a bit of agitation. I've had some experiences with speed, and sometimes I can get a bit cranky. That could ALSO be a determining factor in what you felt during this roll.
Sleeping easily after a roll DOES NOT mean you have a bad pill. Quite the contrary-- if you're having more of a mellow, non hyper roll, then you probably got relatively clean pills.
I have NO research-based idea on the cross effects of birth control and MDMA. However, I have several female friends that are on BC and are able to roll just fine with no ill effects.
Having said all this... Before you roll again I would suggest:
1) Talk to your boyfriend, work out your problems. Be happy with eachother WITHOUT drugs, and you will be even better with each other when rolling.
2) Like I've said before... Give it at least 3 months. I know it sucks, but when you wait, it makes the roll more exciting (like waiting till christmas to open presents... or some shit like that

)