 [ Symptoms ] had sex a week later instead of my normal period had alittle blood when wiped now im sick to stomach and nipples itch could i be pregnant [ Disease ] because you are taking blood thinners it is very likely that you bled quite freely under the skin when that vein was compromised blood is just fine when it is inside a vein but when it leaks outside the vein this hematoma can create quite a bit of inflammation   perhaps the reason for the local redness warmth and swelling it is not possible for this blood leak to get back in your arm to cause a blood clot if this area does not improve with ice compresses it would be good for you to consult your medical provider so you can be properly examined