Please relax. Let me inform you that in early stages, most of the cancers are painless till they start pressure effect on the other tissues or organs.
Since you are breastfeeding
your child (which is the most ideal practice in feeding a new born), your pituitary glad secretes some hormones to facilitate breast secretion. Along with these hormones, a hormone named Oxytocin
also is secreted. This Oxytocin makes the uterus contract which can cause colicky pain in lower abdomen.
Agreed that you are late in smear test, however, being late does not mean that you have got cancer. Usually uterine cancers and cervical cancers present with painless bleeding. I should complement you for your awareness about your health and inclination for screening tests like smear test. You may get your Pap smear
done now also.
You may get clinically examined from Gynaecologist to rule out any pathological cause like infection of the uterus giving rise to lower abdominal pain
. However, in that case you would have suffered from fever and/or foul smelling vaginal discharge
I hope this helps you and assures you today.