You should be concerned about tightness in your chest that lasts for about 3 hours. Such a symptom is inherently, very worrisome. Pulmonary embolism is most unlikely since you are not getting an
intravenousIntravenous
Intravenous pyelogram
Intravenous pyelogram (ivp) injection. Bleeding from the injection site is of no harm.
However the injected anabolic steroids may contain contaminants or impurities. Any of these could be effecting your heart and causing the tightness in your chest. This would be serious. You should confirm the purity of the products you are using. Check into the reputation of the manufacturer. Talk with your doctor about the tightness. Ideally you should have a thorough examine by your doctor along with an
electrocardiogramEcg
Electrocardiogram (ecg) (EKG) at the time you are having the tightness.
Even if there are no objective findings, the tightness alone should be enough to motivate you to stop these injections.