Rule of thumb to dive and live by. If you are asking the question "should I dive" the answer is no. Reason, the question comes from you inner voice, your common sense, you sense of self-preservation. Everything else is you macho, or your desire, or your pocketbook (spent so much to get here) or a combination of all three trying to talk yourself into doing something your inner voice knows better than to do.
How many times have you heard that inner voice, and then talked yourself into going ahead with something only to regret it latter?
As Ann Landers (Dear Abby) says, you already know the answer. If you are asking the question, you already know at some level you should not do the dive.
Your first open water dive will have enough stress and delightful wonderment without the added thrills of a broken toe trying to heal. Wait a few weeks and then enjoy the dive without pain or worrying about your toe.