it may be due to pressure of baby or womb on the clitoris.
if your partner can do this, it should bring u to orgasm.
lay on bed beside him , let him suck your nipples and play with your clitoris for 10 to 20 mins. most woman find that the stimulation of nipples being sucked and clit played with will bring them to orgasm in around 10 to 20 mins.
this way you will get a release of your sexual tension.
but there are no lasting side effects of not having your orgasm, it just means u feel uncomfortable fo a while , as you remain in plateau phase, and dont get the release of tension that u eanestly desire.
but after a while your arousal dies away, and you body returns to normal.