You've found bed bugs in your bed, next steps...
- Remain calm, you will feel exhaustion but, eventually you will feel empowerment in conquering the bugs. Remember you are human, they are bugs, you are the supreme species.
INITIAL CLEANING
2.. Clean the mattress - check all cracks and seams, the babies can be very small to the eye. Vacuum every square inch of the mattress, and then fill a spray bottle with vinegar and/or rubbing alcohol and spray down and wipe every square inch of your mattress clean. Try not to squish the bugs as they might stain your stuff.
Clean the bedframe - repeat the above steps. Find a good flashlight and use it to peak into the cracks and crevices of the bed frame.
Secure a sleeping area - this is an important peace-of-mind step so you can sleep easy, and slowly work through cleaning your place and things. If you have an air mattress blow it up, or use a small sleeping mat. Use baking soda or diatomaceous earth and create a wall around where you are going to be sleeping. Mound like a 1-2 inch high wall of soda or earth around where you will be sleeping so bugs don't crawl into your new, temporary sleeping area going forward. The bugs will not crawl through or over the powder-wall. Dress in warm, clean clothes to bed so you don't need a blanket, as a blanket is something that the bugs can crawl onto if its dragging on the floor and off the bed. Bring a flashlight to bed if needed. You should find no bugs as you sleep.
NEXT DAY - LONG TERM CLEANING
Wash all your clothes in hot water and use the hottest setting of your dryer. Place all the newly clean clothes that are not necessary for the short-term time period into contractor-style or regular garbage bags and close them tight.
Create a laundry area. I personally found some small wood benches, but some nice stools, or chairs can work too. Atop of these benches or stools have two or three empty totes or bins and dump all the laundry and clothes that you will need for the short term like work clothes, basic casual clothes, socks and underwear into the totes/bins. So after you do laundry, dump your laundry right into these totes or bins. At the base of the of the benches or stools mound some baking soda or DE at the legs of the benches or stools so bugs don't crawl up and in. This will secure your laundry from bugs.
By now you have secured a sleeping area, and a functioning day-to-day laundry station that bugs cannot get to. The bugs are now starring at defeat, and you are starring down the road to victory.
Buy a steamer. I got one for about 50 bucks at the hard ware store. Make sure the unit can shoot steam that is very, very hot.
Use the steamer on every square inch of your bed, bed frame and box spring, couches etc. Clean your empty dressers, drawers, all pieces of furniture. Everywhere you think the bugs will be. Put some music on or a podcast and take your time with this process to ensure a good job. The steamer is a very handy tool. This will take time and patience. By now you have a secure sleeping area, and laundry area, and so you can take your time cleaning your place from top to bottom to secure your victory.
Find a space heater (preferably one that doesn't have many safety features as this can be a nuisance), and buy some plastic couch covers and mattress covers (U-HAUL) and try to run the space heater under the plastic sheets and into the covered mattress, box spring and sofa. If you run your heater(s) under these covered mattresses and sofas for a few hours your going to completely destroy and bugs that can't be reached with your steamer. The bugs can't survive temperatures above 130. If you have a thermometer you can monitor the temperatures your getting with your setup.
Once you feel like you've done enough for your mattress and box spring, find a mattress encasing for both. seal up both units and reassemble the bed and mound some DE at the legs of the bed.
Over a span of months, you should see a decline and elimination of bed bugs. Monitor the places that you rest and sit down at and do periodic mattress and sofa checks to ensure they are not re-populating in any missed areas.
good luck.