Assuming they are real MDMA, unless you're among the 2:100,000 users who have a severe reaction to it then ten pills in a single week wont kill you. How do you plan on dosing the pills?
Ten might not even last you a week, even if they are good if you try doing it everyday. Lets say you take one pill the first day and it satisfies you for the night. Most likely you wont sleep very well, then the next day if you take a single pill you will find the effects don't compare to how you felt yesterday. This is the result of tolerence and taking half to another pill may help you reach the same effects as your first time. Then you wont sleep again and the next day will require even more pills to have a good roll. If you start on wednesday and keep it up you'll be out of pills by thursday, likely have a rough crash and be mentally and physically drained.
What you can do is at least space the doses out over a couple days. Do one or two wednesday, wait a couple days for your body to semi-recover (sleep and eat) then do one or two friday, wait a couple more days and do it again. This will still result in tolerence but at least gives your body a break to eat and sleep.
Another alternative is to do several pills over the course of one night to keep you rolling longer, for example you start with one wait an hour or two and then re-dose.
Personally I would drop a couple the first night, have a blast and then save the rest for another week but it all has to do with individual reactions and preference.

Also, take vitamins, hydrate yourself with sports drinks such as gatorade, they contain electrolytes, get some 5-HTP if you can from CVS or health food stores and take 100mg with your ecstasy.