Maybe he bonked your cervix with the head of his penis and it bled a little.
You may have started your period early and that's why you were spotting. Women can sometimes have different kinds of periods that can be late, early, heavier or lighter.
If you're thinking it was implantation bleeding that could not be possible. Not all women have this but when they do it usually happens between 3 and 5 days after unprotected sex. It's when the fertilized egg attaches to the uterus
Anniebrooke could be right too. Maybe he irritated your cervix.
Can I ask why you were waiting for the sperm to come out? It only takes one sperm to get you pregnant and when a man ejaculates there are millions of sperm so there's no way possible for all of them to come out of your body and make you safe from a pregnancy.
Are you having any other symptoms like more bleeding, itching or irritation?
If you're using no protection I highly recommend you see either your Dr or go to a women's clinic. They will give you free condoms and other forms of birth control, possibly for free depending on your income.
Keep us up to date on how you're doing.
Good, if you're having no other symptoms then it's not an infection. Sometimes if women have an infection sex can cause irritation and a little bleeding. That's why I asked if you were having any other symptoms.
How long did the spotting last, was it just that one day? If so then it was probably caused from you being to dry and irritation maybe.
Are you using any kind of birth control? Condoms or the pill? You can have breakthrough bleeding with some forms of birth control.
Do you have a gynecologist? I think any woman or girl that has started her periods and especially if they're sexually active should have one. It's a good idea to see the gynecologist once a year for a pap test and to check to make sure you're healthy. That's who you would see if you went to a women's clinic. And, like I said, if you're not on birth control you can get it from the clinic.
Sorry my messages are so long. You seemed really worried about being pregnant so I wanted to inform you about your options so you won't have an unplanned pregnancy.
Hey there! I have actually started my period during and right after sex. Its a very real possiblity. I doubt you're pregnant. It takes many women a few months of regular unprotected sex to actually conceive. I'm sure it will be fine :)
I was pregnant after my first time and only time of having sex.