Pregnancy related query. After sometime?

I had got pregnant 5 months back. But due to some personal issue (as I have a already 2.5 yrs kid), we aborted it on 5th week by MTP. Now, since last 3 months we are trying to conceive. As we did not succeed, we met with a doctor and went through follicular study. From the study we came to know that follicle are growing very slowly and hence ovulation is not happening properly. We are surprised because just before 5 months only we had conceived naturally. So, what could be the possible reason there is anovulatory cycle post just 5 months? Please suggest some reason behind it. Does abortion has caused some hormonal imbalances which will fix automatically after sometime? I know without gone through all test it is difficult to say, but still share your suggestions as per the experience. Thanks in advance.