I have had 5 high risk pregnancies, (I lost two of them) the first of which I didn't know was high risk until I went into preterm labor more than 3 months before my baby's due date.
We went a LOT more gentle during pregnancy. Nipple stim, especially extreme nipple stim in the 2nd and 3rd trimester can cause uterine contractions, so I'd put the clamps away until you are finished breastfeeding the baby and completely involuted. (Breasts have stopped producing fluid, it can take several month after the child weans.)
I know the orgasms are unbelievable while pregnant! Your uterus is huge and it is intimately involved in both sexual response and orgasm. Orgasm is absolutely fine as long as you remain low risk. At one point in all my pregnancies we were supposed to go "no sex" to prevent me from having contractions. We still had some sex, but he always pulled out (as semen causes contractions, and I was having them too early) and we had much gentler sex until after I was totally healed after the births.
Sex and orgasm are all great and good for you during pregnancy, but some BDSM activities, from nipple clamps to being bound (as you are more susceptible to blood clots during pregnancy, and even light bondage can cause blood vessel issues when you are pregnant) to impact play should usually be put on hold until well after the baby is born.
Sorry to be the bringer of bad news, but I've been there. We play hard, but with pregnancy we had to find more gentle ways to make love. It all turned out great, though. Our kids are all older and we can play as hard as we love to now.
Have a good time, but take it easy.
