LH strips rct

I got pregnant first try back in June 2024, had a miscarriage Aug 17, 2024. Ever since then I’ve been trying to get pregnant. My cycle is irregular. I used LH strips this past round and it was positive on day 24. We had sex that day and 2 days after. I just took a pregnancy test because I’m slightly impatient and it was negative. Today is day 33 and it was negative. Is it just too soon? I thought it would highly increase my chances of getting pregnant by using the strips.