Check with your doctor.

It will partly depend on your fitness level, and on how intense the exercise is. A lot of it seems to be about going with what your body says is OK, and being prepared to slow it down if you need to.

At 20 weeks I am still cycling regularly, but I have found that I get puffed more easily, so have to slow down on the hills. This might not be possible for you, in the intensity of a match.

I have read that you're not supposed to let your heart rate get over 140 BPM. Mine goes over that when cycling now, some of the time. I called the midwife and asked her and she told me that since this is exercise I've been doing for years and my body is totally used to it, that's OK.

I'm now gradually switching my cycling over to swimming, so I keep up the exercise in a form that is less intense and safer (risk of being hit by a car, on the bike, of course). You might need to think about how you will get your exercise when you stil playing.