Not testing positive until later?

Just wondering if anyone has experienced something similar.

I track ovulation and ovulated April 10, I always spot before my period but has been completely zero spotting. I have a 30 day cycle consistently. I am currently on day 35. I tend to have a lot of cramping and bloating during and a few days before my period starts- fairly painful periods.

The last couple days I’ve felt a bit nauseous, but nothing a bit of food couldn’t solve, last night I experienced a bit of mild cramping which didn’t last long. Then again this morning but very mild and didn’t last long. I would say no breast tenderness but possibly a bit more tired.

I do have a fairly high stress job which has increased stress this much but I’m fairly good at managing it.

I’ve tested a few times this week with first pee and 2nd pee and no positives, I couldn’t see faint lines either. With no name brand early detection and the strips.

Technically I would be about 4weeks and a few days, did anyone else experience low hcg at the start and not much for symptoms? I won’t be able to get to a dr for about a week but the internet hasn’t been overly helpful.