There shouldn't be any issue as it's perfectly safe, but as PPs have said, no harm in running it past your care giver to ease your mind with the spotting.
However, a word of warning for when you do go for it... Not sure how far along you are, but for me orgasms after around 18 weeks became really quite strange. My tummy goes so hard and tensed up as though baby has suddenly tripled in size and is pushing against me. To be honest I find it very uncomfortable, although not painful, and so avoid them but keep having them in my sleep! Again, this does no harm to baby at all and a few of my friends said they get the same thing so it's very normal, just wanted to let you know as if you are worried anyway then this happens, don't want you to panic!