Line readers: Is this negative?

So i’m 9 days late for my period but im also 7 months postpartum and exclusively breastfeeding. Since 3 months postpartum i’ve had a period every month (nov, dec, jan) but my february period is the one i’ve missed. I did a pregnancy test today as im late and it came back with 1 line (negative). Shall i retest or would this be accurate? I was hoping to not be pregnant right now so i am happy with this result but i dont know if i need to retest? Also in terms of contraception, what is everyone using? what’s best? what has the least risks? I am going to speak to my GP about it this week coming but i just want to have an idea in my head before i go in. Id appreciate any help/experience/advice. TYSM☺️