Really need some Advice! Four days late and no bfps yet!

Britney • I'm a happily married to the love of my life and I'm a 27 year old who is graduating university soon this year and is hoping to start having some beautiful babies soon! We have had one pregnancy and miscarriage at 7 weeks so far hoping for a rainbow baby
I'm four days late for my af but I have tons of symptoms and my cervix is low and soft tons of cm that is slippery/creamy exhausted and high bbt sore boobs and more! I tests on 7-8dpo and got to vfl on each (the second day darker than the first) but now I used some other brands and I haven't gotten any other lines could it still be too early? When should I see my doctor and when should I test again and with what kind of test? Ive never had any luck with first response so far