if you post this in baby you might get some good advice as there are qite a few mummies co-sleeping. i dont as dd sleeps fine in her cot next to our bed, and previously her basket. i have been told as long as baby is next to you, as in not inbetween you and hubby, as you are more likely to wake. and as long as you dont smoke, drink alcohol (whatever that is) or are very tired. and that you are using the right bedding so baby doesnt over heat. a fried of mine cosleeps still at 20 weeks. she has already even took her baby camping to a festival! in a tent!
Human beings, who are almost unique in having the ability to learn from the experience of others, are also remarkable for their apparent disinclination to do so.