Flicking the bean first trimester tmi

Hubby hasn’t come near me in nearly 2 weeks and I couldn’t help but masturbate today. I did it about 3 times this morning and was still crazy horny this afternoon so I did it again. I am 13 weeks. I haven’t had any cramps or bleeding but I can’t help but feel bad about doing it, I fear that from me tending up and causing my uterus to contract it will stop the babies heart. I won’t have another ultrasound until 16 weeks and now I’m scared I’ve done something wrong.