Yes unless complications...or doc advises differant.
Oh wow, you're lucky to know you're 4 weeks pregnant, usually it takes about 8 weeks to find out... Hmmm. Yes sex is safe, but wear protection if you aren't 100% that you are pregnant ((Told by a doctor)). Unless you are actually trying for one.
Yes! You can have sex throughout the whole 40 weeks of your pregnancy, unless your doc tells you otherwise
Unless yer doctor tells yu otherwise sex is safe yer whole pregnancy