Medical opinion - you are not more likely to suffer an embolism, as that is associated with overactive rather than underactive clotting. While there are many different conditions that may make you more likely to bruise/bleed, most bruises are nothing to worry about. If there is a strong family history of easy/large bruising, bleeding into joints (actually into the joint, not just a bruise over your knee), or you tend to bleed excessively from small cuts etc then it may be worth seeing someone.
However, other factors, like having pale skin, or the bruise sites (if you are crawling, you tend to hit the same area repeatedly, so the bruise will be bigger) may also have a role.
While the most impressive bruising after caving I have seen was on a woman, I am not aware of any medical evidence that women are more likely to bruise. I expect other factors like men having hairy legs, and therefore obscuring the bruises plays a not insignificant role. There probably is a reduction in bruising as you get more experienced and your technique improves, but the trips listed imply you are fairly experienced already. Caving 4 times a week probably means you get new bruises before the old ones heal as it takes about 14 days for a bruise to fully disappear. You could try caving less frequently, but that is definitely not mmy medical advice!