12 weeks and bleeding

CJM • Mom of 4 (soon to be 5). 💙💙💜💙💙2015, 2015, 2017, 2020, & prego!
I went to the bathroom while at the gym and had 5-6 blood clots and a general red color in the toilet bowl. 
There are two things I can think that may have cause this... 
#1 Sex. Me and my husband had a pretty good romp session both last night about 10pm and then this morning before he left for work around 4am. It included some fingering which can sometimes be a little rough and cause me to spot when not pregnant. 
#2 Workout. I was about 30 minutes into a muscle works class at my gym (which is light weightlifting to music) when I noticed a wet sensation and went to the bathroom to investigate and find the bleeding. 
I'm home from the gym now and haven't had any more clots, just red spotting when I wipe. 
I'm contimplating calling my doc, but this is my first pregnancy and don't want to freak out over nothing. 
Has anyone else had this happen to them for either reason? I'm not sure what cause it but I'll have to try to narrow it down. 
And assurance or advise is appreciated.