Starting to exercise?

I started exercising (reformer!) 2 weeks ago after a very long time. All the advice for exercise during pregnancy is to continue as you were - for me that would be no exercise at all (i’m only 4w1d today).

Anyone know about starting to exercise the same time you get pregnant? I’m super unfit right now and I’ve been wanting to make sure I have stamina and strength for running after future baby AND my toddler come September.

But I haven’t seen any advice online on starting to exercise when pregnant if you haven’t been doing it at all prior to expecting.

I just know it can’t be healthy to be so sedentary so a part of me wants to continue with reformer but I feel confused about the information I’ve read about physical activity during pregnancy so far!