Only you can decide YG!!! We're about to have no3, and I keep telling myself to REMEMBER how utterly wretched being pg can be - sickness was MUCH worse this time, being sick 3 or 4 times a day for weeks, when only felt sick with the other 2, trying to manage a 2 year old when 36 weeks pg is not much fun, children demanding your attention the whole time when you just want to sleep, the achey pelvis, not being able to get comfortable at night, needing the toilet all night, BH contractions, heart burn.....
BUT, at the end of it all is a new baby! But you need to decide if you can cope with another, financially, emotionally, space wise in your house.
Have fun deciding!!!