Inducing naturally rather then having the doctor?

Well I know sex and spicy food and walking can bring on labour but I was wondering does it normally take a week or two of doing those things or is it faster acting? Im 35 weeks now and was wondering because my husband will be gone july 14 - 22 and if I dont have the baby by the 23 my doctor is going to induce ill be full term (37 weeks) july 6 and was wanting to try to bring on labour between then and the 14 so my husband can be there with me im so scared and dont want to end up having her by myself when hes gone any advise anyone help please