Not sure about your first Q. Soundd like a Q for your Dr. if it persists. As to 2nd Q, early in pregnancy spotting is usually implantation bleeding and no big deal. You could call your Dr to be sure. Also, get him reading some "for future dads" type material. Something that's not too girly. I like the Mayo Clinic's Healthy Pregnancy book. It might helps to let him know your hormones are going nuts and since you will soon have a baby interrupting your everything intimate he might want to take advantage of your libido, providing you are feeling well! Good luck!
Some men refuse to have sex during pregnancy and the thing is at some point you will be so horny that you will want it every day or twice a day. I suggest taking him with you to the doctor and ask the doctor about the spotting after sex. Chances are the doctor will say enough to convince you both that it's normal and having sex during pregnancy is ok