What is a normal bpm? i checked mine the past few days and it was 95-100. my blood pressure is usually on low side. should i worry?

Variable: The theoretical peak heart rate for a 28 year old is about 192. A hr of 192 would be normal for you during peak exertion. A normal resting hr is generally somewhere in the range of 60-100. Mild exertion, anxiety, fever, anemia, caffeine, etc could keep it in the 90-100 range. During sleep, heart rates often dip very low, even into the 40s. Low BP is good if you're otherwise feeling well.