Help...

Sophie

I had my first 16 months ago, he was a big surprise as we didn’t find out until I was 25 weeks (I had no changes etc and my periods have always been different). We have been trying for our second for about 3 months.. I keep feeling like I will be due on my period for about a week now but nothing yet. Is this normal? Any suggestions? Sides of my boobs are tender to touch and I do get a severe back ache when on my feet for 2+ hours.