Possibly tmi

My partner and I just had sex for the 1st time in close to 6weeks and afterwards I noticed some fresh bright blood some very small (stringy) clots should I be concerned? This is Bub #4 and never had this problem before, can still feel baby move, no cramping etc  
Should mention I'm 25 weeks, and have had some slight complications from the beginning and was on pelvic rest for a few weeks