How do you handle being sexually active without a period?

Hello, so I (20m) for the first time in many years am sexually active with a cis man on a regular basis. The last time I was sexually active like this was pre-T so this is all new grounds to me so just bare with me.

Now, I'm not stupid, I listen in my appointments, T is not birth control. I'm 100% aware of that. I've already read things and gotten advice on birth control options and booked an appointment to get on some. I'm just wondering how do I deal with knowing if I am potentially pregnant? In the past I relied on periods for that and as I don't get them anymore I know this isn't an option. So I was wondering what other men in this position do? Is this a "fuck it we ball" moment?