@Aly92- each of my pregnancies have had different, early symptoms.
1st preg- I had erect, perky nipples for 2 days before I'd even tested. Just thought it was strange and never even thought about pregnancy. By then, I'd been TTC 4yrs, so thought it would never happen. Constipation (from the hormones) started about 6 weeks. Morning sickness didn't start till 8 weeks with that one.
2nd preg- No erect nipples, but heightened sense of smell early on. Constipation and really bad morning sickness right from the start. Sickness and nausea was worse than 1st pregnancy, then all symptoms just stopped. Later than week I MC.
Current pregnancy- Erect, very sensitive nipples again, and very horny!
. Constipation just starting and 2 days of nausea so far.
With all 3, I had aches, pulling sensations and sharp pain lasting seconds from time to time. I too worried it was AF starting/MC etc. I'd read that the hormones loosen the uterine ligaments, and these are often these early sensations. Wind and constipation can also cause great pain. With the 2nd, I was getting 1 sided pain, so went to A&E, concerned about ectopic. I have some small fibroids, and it was more likely the hormonal effect on these that caused the pain, as tubes were fine.
Sorry, my replies have ended up being massive. I just wish I'd know some of these things with my early pregnancies!