You probably can use your trampoline
if you don't have any complications, but of course ask your doc first. I had read that gentle exercise is best and was nauseous in the first tri so I switched from jogging to walking for a while. The jogging got to be too much on my body so now thankfully I am swimming (ahhh- it feels so good). I also have been doing pilates my whole pregnancy- in the first tri I just used my regular videos, then I bought two really good ones. "10 minute solutions prenatal pilates" and "Pilates during pregnancy". The second one is a really good workout. I was also a dancer so once a week I do a ballet workout and LOTS of stretching. Exercise has helped me SO much during pregnancy that I highly recommend it. It has helped me physically feel better, sleep better, helped with nausea, kept me in shape- I could go on and on. You also can exercise lying on your back
if it is on an incline- my videos have you use blankets and pillows- they just don't want you flat on your back for more than 5 mins. or so. Does your pilates machine have an incline? I also have been subscribing to "Fit Pregnancy" since I was
ttc- I highly recommend that as well. Their website is really good too. Feel free to PM me with any questions/concerns.