Similarities and differences with each:
No 1 - occasional nausea in first 12 weeks, lots of burping episodes in first 12 weeks : $ , one episode of early pregnancy bleeding - Girl
No 2 - a bit of nausea in first 12 weeks, two episodes of early pregnancy bleeding - Girl
No 3 - nausea most of first 14 weeks, no early pregnancy bleeding, very bloated by 12 weeks such that people were asking was I expecting went by 14 weeks, severe headaches several times a week from 11-20 ish weeks - Boy
No 4 - currently near 15 weeks pregnant, nausea for 90% of waking hours only just passing now, have been sick a few times, very tired (could be related to 3 other kids aged 5 and under : ) ), no early pregnancy bleeding, no bloating and still wearing normal jeans, had a few headaches in last 2 weeks but not as many as with no. 3, very low blood pressure that has been causing me to feel dizzy and faint, having trouble going into a deep sleep at night so waking frequently - sex anyones guess : )