I just really need some feed back and stories or just some advice on things.

I wanna have a 3 baby, didn’t have a to try with my first to kids(but they weren’t really planed) this one I’ve been planning, I’ve tried a lot in November, now we are two weeks into December I’ve taken about 4 test before Wednesday and have came back negative, so my last period was before Halloween, if I’m stressing about it, I know your period can be late or you can miss it completely (so I’ve read) I’ve stressed before about things and I’ve alway got my period every month, it supposed to be the last week of the month or if it’s been late it will be two or 3 days into the next month but never this late, I haven’t gone in yet to try to get blood work done because I’m just wondering if it’s possible for my period to be this late or is it possible I could be pregnant and I just don’t have enough HCG to show up on a home pregnancy test, that could be why I’m getting a negative test, or I’m stressing and I just don’t see it that’s why I’m late on my period.