OK, first, you will want to get your tax returns that show the W2 for Woolworths, to prove you earned there - that may pop in any missing credits from that time frame, if you didn't otherwise have 4 credits for that particular year.
If you are unable to prove that you had legitimately more earnings to substantiate the 2 missing credits, the easiest solution would be for you to earn 2 more credits. You can do it right now, this quarter or year, but earning $1220 GROSS, x 2. So if you got a full time or part time job and earned 2440, and paid the taxes on that gross amount (SS taxes and Medicare taxes, also referred to has FICA), you will be automatically 'insured' for retirement. This could be an simple summer job doing something you enjoy... or not. But, you are SO close to having enough credits, you owe it to yourself to get them. And if you can't produce the Wool worths proof this is your best bet
Now, as an aside remember that you are also likely eligible for spousal benefit on your husband's work record, either now or in the future. If you want to review your particulars with regard to that, and the possibilities of him filing/suspending and triggering your right to benefits (spousal), we can do that. I will ask that an "additional services" offer be made to you - at your option, for later discussion if you wish.