Help!!

I just had a miscarriage at 12 weeks and found out on the December 28 of last month. I had to have a natural miscarriage and the baby and everything naturally discharged by January 7/8th.. my do .org said wait 3 weeks before I had sex again but I didn’t wait quit that time maybe a week or more... can’t remember when we had sex because I stopped writing it down. So I don’t know when I ovulated but now I think this is a positive test. How can I know ? The only thing I can think of is going to the doctor but I think I might be 3 weeks at most but I have had 3 miscarriage in the past 2 years 2 back to back ..so I am so scared to schedule an appointment so early. So many emotions going on. HELP