pulses I have one of those, I wore it for our run the other day with a vest over. I wear a sports Bra under, but as you know my boobs are larger and need more support!
Try it on and jump around, jog on the spot and see how supportive it feels. H&m had some reasonably priced sports bras in the other day that looked supportive, they don't go up big enough for me but I think they would for you.
You may want to be careful not to squash your boobs too much as you are still feeding?
I am going out for a run this eve when it's cooler, I think I will start on wks 5 of couch to 10k. And then I can build up my stamina a bit, my legs are coping fine with running but I am getting breathless... Must find my inhaler as well!
Hope everyone has a lovely weekend and enjoy parkruns if you are doing them, no childcare here so I won't be, maybe next week.