I want to ask how long it took you to conceive?

So my husband and I started trying exactly 1 year ago this month. We conceived in March but I miscarried in May. (Blighted ovum)

My cycles are always 28-30 days. I always get a positive ovulation test. I’ve been taking prenatals. I weigh 133lbs. We are only 23. We had a baby at 17 from first try. Why can’t we conceive now? How long did it take you to conceive?