I take it, from other threads, you two are co-habitating (e.g. living together, before marriage). Now, I’m not going to bear down on you, like some others may. I did the co-habitation thing for three years; and I ended up splitting with my ex, at the time. I didn’t start living with her, until about a year of being with her.
Being with a person for five months, and going into co-habitation is a little soon, IMO, let alone marriage - or, the thought regarding preparation for it. More often than not, the foundation will/would be on shaky ground to start, if you both aren’t grounded in what you collectively need. Faiths aside, if there isn’t this collective awareness/understanding, things may ride down that slippery slope.
It takes a certain temperament to be able to transition from co-habitation, to formally being married, in my mind. My sister, and her husband co-habitated, but it was a forgone conclusion they’d be married, some day (did end up married on June 18, 2011). They were together for nine years before ultimately marrying. A very good friend of mine (who I’ve known since age 3) didn’t marry his wife, until 10 years after being with her.