Confused

I'm 14/15 dpo today and was suppose to start yesterday. No sign of AF at this moment like the normal sore boobs, cramps etc. Took a frer test yesterday morning and this morning. Both look negative. I took a Wondfo couple of days ago that looked like it had a faint line. (I'm left with the first response digital now) I know that cp and cm is not always a reliable indicator of anything but upon inspection I noticed my cervix is really high like to the point I can't even reach it. I've also got this milky colored cm not thick but creamy like. No pink tint to it when I wipe nor anything but the mucas after I check. Also there was a pretty big temp spike this morning on bbt. Is it possible that HCG just isn't high enough to register yet? I have regular 28 day cycles. Pretty textbook I'd say. Any input is much appreciated.