one day or two late what's going on? 🤔

So I'm a day or two late. Glo estimated my period to come yesterday and my other app estimated two days ago. Either way I'm late and no sign of AF. I have headaches here and there was really hungry this morning felt nauseous if I didn't eat. Feel extremely bloated. My Cervix is high and feels firm like the tip of my nose and seems to be closed. I have creamy thick white discharge here and there that I never get. But I took a pregnancy test this morning and got a BFN. I know they say sometimes you have to wait a week after missed period before testing. Because my HCG levels might not be high enough. I do recall testing day of my period last year when I was preggo and got a BFN at the doctors office so it might be that mine doesn't show till after a week. But I'm worried it might be something else even though my periods are always regular and I did test with an opk earlier this month and it did indicate that I was ovulating. Anyone experiencing the same?