Just that really. It's my first pregnancy and I'm terrified at every turn that something will go wrong (ivf pregnancy after years of infertility, 2 significant bleeds). I'm 19 weeks, anterior placenta, and my lower abdomen feels heavy at times and then it aches and could be classed as very light cramps- except it's constant not coming in waves. I suspect it's all normal- but I'd hate to take risks.