buying pressed🤔

I've gotten pregnant last year naturally but shortly after finding out I miscarried at 6 weeks. Me and my SO hasn't BD alot during my fertile week so I wouldn't say we been trying since our lost. But this month we both agreed we are ready to try again hoping for our rainbow baby🙏 My fertile week is March 7-13 and I'm thinking to myself to go buy preseed or not. Can someone please give advice, suggestions, or comments on using preseed & also some successful stories behind preseed.