So my boyfriend and I had a serious long talk last night, he told me his "timeline" is engagement…

So my boyfriend and I had a serious long talk last night, he told me his "timeline" is engagement 2019, marriage 2020. We agree we want a baby in the near future. (Preferably when married but engaged is okay)

With him having low morphology and motility, we know ttc will be a little tough (especially naturally) so my question is, with us going the natural route (I'm open to having a child sooner if it spares us the whole ivf process)... When would make sense to start? Given the timeline. I know it's hard to say because you just never know.. But I'm just seeking opinions 😫🤔🙇🏽‍♀️