You can have intercourse through the entire pregnancy unless you have a risky pregnancy and the doctor say otherwise.
during ovluation.
no, get a proper contraception
During sexual intercourse usually.
If your already pregnant and have sexual intercourse during anytime of your pregnancy you can not get pregnant.
Yes it does.
I do not know if it is "safer" but it is all good to have intercourse during pregnancy. In fact a womans libido usually increases during pregnancy (which I am sure your husband will find to be a nice change!) . Also, orgasms release a hormone that can actually help headaches and fatigue so go for it!
The only way to prevent pregnancy without contraception is by abstaining from sexual intercourse. Unfortunately there is no way to prevent pregnancy from occurring with 100% accuracy unless you use contraception every time you have intercourse.
You can't control this during sexual intercourse.
Pre-ejaculate.
Unless they break during intercourse.
you should always check with your doctor first, but as long as it is a healthy & normal pregnancy and there is no discomfort it should be ok.