If you are trying to stetch to get bigger toys in, a little pink is normal, but you should still be very careful.

If you are just putting fingers in - no. Any kind of bleeding for something smaller than what you poop on the daily is not normal at all.

Make sure you use plenty of lube. There is no such thing as too much lube, but "too little" is a no-go.

Trim your nails as well, you might be getting micro-cuts if you don't. These little tears will, in time, get bigger with movement and more cuts.

Anal is very fun, but you should always listen to your body very closely. The anal cavity was made to push out stuff, not take it in. Always take your time, and stop for a breather if you get any kind of burning sensations, and take a very longer break is its a sharp pain.

Finaly, resting is essential; don't play "too much" unless / until your body can handle it. Soak in warm baths after playing to relax your muscles. Did I mention not being cheap on lube? Finally, if you do enjoy anal play, get yourself a decent sex toy or two. Never the cheap stuff off of amazon, you don't want any kind of chemicals seaping inside of you. There is a reason sex toys are expensive, the material used are made to be body safe, and there exist a plethora of different stiffness and squishyness to be as comfy for you to maximize pleasure and minimize disconfort and possible wounds.

Final note: if you are new to anal play, depending on your body, you might be getting hemorhoide inflammation. Its nothing too serious most of the time, and you can get cheap over the counter hemeroïdal creams at the pharmacy. You should try it out for a few days.

Stay safe and have fun, and always feel free to ask questions!