My period slowed down then picked up again, can endometrial tissue block blood flow during a period? will this be temporary and should it pick up again? my periods have done this before but been awhile. im on birth control too?

Variation: What you described seems to fall within the normal variation of flow in a period. As long as you are not bleeding excessively, you may watch and wait. Have a healthy diet, exercise 30 minutes/day, drink plenty of water, have safe sex, no tobacco alcohol weed or street drugs. For nutrition: http://www.choosemyplate.gov/. Wish you good health!