Hello, Thanks for sharing your health concern with us. I have gone through your query and would like to offer some information. If you did not have any intercourse for the past three months and have had natural periods after that, pregnancy is not possible. Withdrawal bleeding can be expected 3-7 days after the completion of hormone course. Sometimes, it may take up to ten days. Thicker endometrium can be due to hormone imbalance as well. To clarify, you can go for the estimation of the serum beta-hCG titres or repeat the sonogram, in the trans-vaginal route after a week. Further management can be planned accordingly. Hope this helps.