I can see that your concerned because of your current problem. The potential reasons for this repeated infection can be that either your partner is also infected (and he has not taken the necessary antibiotics) or a foci of this infection, which is not being eliminated by the course of antibiotics. Usually patients and partners both require prolonged antibiotic treatment and you should talk to your partner and ask the doc to prescribe him a course of antibiotics as well.
Couple do conceive even with bacterial vaginosis
, although it is better to get rid of it before starting a family.
Hope your problem resolves soon