I haven’t gotten the chance to get my first ultrasound yet because insurance is not working with me at the moment so please help me !

The first day of my last period was June 7 and it says I ovulated June 20-28. My husband and I have a lot of time together so I can not pinpoint an exact conception day :)

Is it true that I cannot get pregnant after ovulation ends? Does that mean I would have had to get pregnant before June 30?

Any advice would be extremely helpful !!!!