3 weeks late

In June I had a CP. We have been trying since but my periods seem to be off. This month I am 3 weeks late no positives test not even a blood test. So here's the kicker... Last night I had bright red blood after brown discharge all day. Today when I woke up I had nothing. This happened last month. But what I'm afraid of is that my body is messed up from the chemical pregnancy 2 months ago. If it is how long does it take for your body to regulate again? We really want to get back to trying. But is it a waste of time if my periods are irregular now?? Am I even able to ovulate???