Am I really pregnant? CM and HPT pics below

Amie
Hi all. 
I'm 25 years old, a mummy of 3, I have been with my fiancée for 10years.
I had my implanon out on the 11th April.
I had AF on 11th May until 18th May.
Been having regular sex.
I took a HPT on the 7th June because I felt like I was maybe pregnant, and had a BFN.
AF was due on the 11th of June.
I took another HPT on 12th June, and had a BFP. The second line came up STRAIGHT AWAY.
The tests were a twin pack, and were new not out of date. 
Could the first test of been too early too test and that's why the BFN, as it was before AF was due. Or is the BFP wrong? 
Still no AF.
CM is shown below. Along with PT.
Am I really pregnant or could this be a false positive?
I have 3 children, and my youngest is 3 in August. So this would be our 4th baby.
My breasts are sore and lumpy.
I've been having sharp pains at bottom of stomach when I stand up too quick.
I know I have had 3 pregnancies but can't remember the signs of them.
I really think I am pregnant but would like someone to confirm please? 
I'm thinking maybe I should but another test? But if I have a BFP with no AF, I'm wondering if I should bother? Lol.I have recently moved house so am registering at GP this week.
Thanks in advance.
XxxX