Opinions on this doppler ?

Today marks 7 weeks so I want to order a doppler so once I'm 8 weeks I can start trying to find it. Now, I'm plus sized so I have a Lil extra cushion. Does that make a difference on how easy it will be to find? Should i wait till 9 weeks? I know these are kinda stupid questions but it's been 7 years since I've had a successful pregnancy. I divorced my husband, got remarried and we started Ttc last year. Got pregnant in February, then sadly had a miscarriage in April. Now we have our rainbow. I have an ultrasound on Monday the 11th, so that will keep me calm for a few days hopefully. I just can't help but worry over every little thing. Once I can feel movement ill be able to relax a lot more. Anyways, point of this post is to see if anyone has used this specific brand or if they know of a better brand. Also if me being plus sized would be an issue. I mean I'm not huge, my belly is relatively flat when I lay down haha I just have a Lil extra cushion for the pushin 😂😂😂