It is perfectly fine unless your doctor says otherwise. I know at the end of your pregnancy it is really healthy. Because it help thin your membrane which is a good thing.
You can definitely still have sex while you're pregnant unless your doctors specifies that you can't for health reasons. You can find comfortable sex positions for pregnancy on websites like babycenter.com...It's perfectly normal...if you're unsure ask your doctor!
A little bleeding after sex is normal...
Yes of course! Its fine! The baby is high up side so it wont bump the baby or something like that! No worries! Unless you are a high risk pregnancy. I am sure your doctor would give you the go ahead.
It is fine unless you are a high risk pregnancy or having other problems. Your Ob would be the person to ask because she knows your pregnancy and your body the best