Thanks for the query.
Your cramping can be due to implantation
of gestational sac
Though the incidence of ectopic pregnancy is rare we cannot rule out the possibility.
Sometimes blood may not come out in case of ectopic pregnancy.
So better to undergo ultrasound which will rule out the possibility of ectopic pregnancy and also confirm the gestational age
Some amount of indigestion, constipation
can be seen in pregnancy due to hormones that may be responsible for your problem. If needed you can go for laxatives with your doctor's advice.