Hey mama, welcome sa community! So if your LMP is June 18 and due date is March 25, you're looking at around 22 weeks, which matches what you said, and you likely conceived somewhere mid-to-late June, probably around the time ng ovulation mo (usually around day 14 of your cycle, but varies talaga). Our fertile window is usually around 5 days before ovulation and 1 day after, so roughly 6 days of the month kung regular ang cycle mo, pero honestly, best na mag-consult sa OB mo para sa exact details ng conception kasi sila ang makakasabi ng tama based sa dating scan mo. How are you feeling so far sa pregnancy?